Yuri1 and revival: Huh. Looked at a FAQ, and if I read it right it does claim that it's only Sandalphon (lvl. 3) that has the revival, the lvl. 1 Light fusion might just be healing. Can someone confirm this? Assuming it is just Yuri2 and Yukiko...
Can Lulu be MP drained: Looking it up, I see that SH2 Mind Assault has a 150% recharge time (aside from Yuri's fusions generally being fast anyway). Against Lulu's .71 first turn speed and .75 later speed, Yuri2 is easily getting 3 Mind Assaults off before Lulu's 2nd turn. OTOH, Lulu has 174% average MP and she does need to lose it all. No idea how much to respect Yuri's draining since this isn't SO3 where you could actually make an MP damage average, but to use his own MP score as a baseline... Yuri2 drains about 40% of his own max MP at endgame apparently? And call it 30% for Yuri1 (worse than I thought). I forget how much this would be different in the early game. Anyway, 40*3 + 30*2 = 180% max MP drained. It's close, but generally willing to tiebreak for players over the dungeon. On the other hand... can Nina1's Wall make a difference (Reminder: it's just one shot of half-reflect)? I was inclined to think "no" before, but maybe so. If she casts it the first turn, Chie & Yukiko kill her, but they don't have a spare turn to knock the Wall off... if Chie does toss a worthless Ice spell to get rid of it, it sounds like Lulu is brutal enough to kill them all so that Nina can get away with Wall on turn 2. Hrmm. I'd assumed that Nina would need to Hold before, since I was assuming Lulu was Deathing Yukiko & Ditto... Lulu being able to kill all three due to triple-turning (didn't know she could do that) does change things.
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As for the Summoners fight... this is really a fight where Love-Love stabs Andrew in the back, as it means the summoners easily flatten Yukiko while the Yuris have trouble even doing simple tasks like "beat up Rydia." The team really can't let Rydia ever get a turn (Frog, elemental weakness hitting), but the summoners can't ever let Ditto get a turn once he becomes Eiko (status-healing, full revival). Here seem to be the main ways this shakes out:
Girls don't defend round 1: Garnet Shivas Yukiko, Ifrits Chie, and... Arks Yukiko for the KO (If Yukiko gets a turn, the Yuris would magic-buff her and she'd start OHKOing Rydia and others). Chie... can she OHKO Rydia with Love-Love help? Doubt it, so Yuri1 probably has to chip in. Yuri2 revives Yukiko. Eiko... hmm, Phoenix Flame would be ST team, ST enemy I assume? Phoenix revives Rydia, knocks over Chie for a free turn, then Holies Yukiko dead again on the double. Ditto becomes Eiko. Round 2... Chie defends rather than give Garnet a free KO (she's already eaten Love-Love powered Ifrit & Phoenix). Garnet heals Rydia, Yuri2 revives Yukiko, Yuri1... needs to heal one of Chie or Yukiko, and also needs to be concerned about the upcoming Eiko / Rydia turn. Let's say he heals someone. Eiko... tries to Mini Ditto-Eiko? Probably won't work, but then there's a speedoff between slow Rydia, who was revived at average initiative last round (so 100+~130), and the now-average speed Ditto who became average speed while slow (125+100). So I guess Ditto-Eiko wins. If he wasn't Mini'ed before, he heals whoever Yuri1 didn't heal. Rydia now needs to Frog Ditto as Ditto has Esuna. But still looking kinda bad, since while the summoners might be getting low on MP, Team Andrew isn't getting anywhere... the girls can't defend lest the team give up any chance to kill Rydia, so round 1 semi-repeats as Garnet wipes out Yukiko and damages Chie. Chie hits Rydia, Yuri1 finishes the job, Yuri2 revives Yukiko, Eiko does Phoenix->Holy to re-kill Yukiko and revive Rydia, but Ditto's still Frogged. Round 4, Chie defends again, Garnet heals Rydia again, and the Yuris are helpless to stop Rydia from Frogging Yuri2 now that Ditto isn't an issue. Granted, Garnet has little gas left in the tank at this point (the two Arks she had to cast slurp MP like crazy), but it doesn't matter. And this was all assuming that Eiko's Mini of Ditto didn't hit.
Yukiko Defends: Garnet Ifrit->Arks Chie, KO. The Yuris... could try their MP-suck magic on Rydia? Maybe? But FF4 is a cast where Kain & other 0 MPers drag up Rydia's effective MP, so probably not going to do it in 2 moves, which is what they need. This means Rydia gets a turn which is Bad Times. Yuri2 Raise Ups Chie, Yuri1 heals her. Rydia Fire3s Chie then makes Yuri2 experience the "Frog" fusion, and next round Garnet & Eiko kill Ditto (before he can Esuna / Full-Life). Garnet also tosses in a free Ifrit of Chie.... she might well be dead, but let's assume not. Chie hits Eiko (but probably doesn't OHKO?), Yuri1 magic-buffs Yukiko, and she Agis out Rydia... but I think it's too late to recover? Yukiko needs to defend again round 3 lest she be destroyed by Garnet, meaning Eiko has a license to full-life Rydia while Garnet attempts to Mini or Berserk Yuri1 if Yukiko defends.
Okay, that didn't work. What if three MP-drains would disable Rydia? Backing up, the Yuris can go for that at the cost of reviving Chie and buffing Yukiko... so round 1, Mind Assaulting from the Yuris, Yuri2 still gets Frogged. Round 2... Garnet & Eiko still need to kill Ditto, Yuri1 finishes off Rydia's MP, Yukiko revives Chie (Agi isn't so helpful because FF9 is probably halving Fire here). Round 3... Yukiko defends again. Garnet can probably kill revived Chie through Defend with Ark, but her MP reserves are getting low by now because Ark slurps MP like crazy. Yuri1 finishes off Garnet's MP. Eiko tries to Mini Yuri1? If she hits, she can try to start Holying him out, but with Garnet out of MP and Eiko lacking Ice, Yukiko is free to just heal even a minied Yuri1 and win the resource war. I guess she tries to Mini Yukiko instead, but Yukiko can revive Ditto, Mini doesn't last forever, and this required that Eiko hit Yuri with Mini in the first place (lest Yuri1 keep going and Mind Assaulting Eiko out). Yeah, this requires too much luck, so Eiko probably doesn't take this herself. Eventually, after the opposing team is reduced to mage physicals, Ditto is put into commission as an Eiko-clone to get the team back on their feet, even if Yuri1 has gone crazy.
Yukiko & Chie Defend: Garnet tries to Mini or Berserk Yuri2. If it works, Andrew is now counting on Yuri1 and Yuri1 alone to do anything this round. Let's assume it doesn't. There's still not much for 'em to do - I guess there's still the MP-drain Rydia strategy, but even if the Yuris could MP drain Rydia in two actions, Eiko gets a shot at Mini, too. Eh, if the Yuris could in fact MP drain Rydia out in two actions, they're better off with one of the above strategies, and if they can't the combination of status from all three means that the Yuris are out of the fight in round 2 which is deadly.
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Tentatively, the second strategy does seem the best one for Team Andrew, but that does require 3 MP-drains being enough to reduce Rydia to 0 MP, which is pretty questionable. Actually leaning more toward fail at the moment, the summoners fight is brutal.