Evrae is 2.32 PC HP, has 100% Petrify and 100% Slow (Slow not curable by Status curing, so even if someone is stoned, that's still an issue) and average physical damage
Defender X is 3 PC HP, 3.5 Pdur, can use 114% ITE damage every 4 turns (and assuming he can immediately. 60% Damage otherwise that's crazed accuracy anyways) and counters every third attack with 50% MHP and 50% delay.
Ephraim hits Evrae, Evrae stones Ephraim, 1 of Jessica/Alicia/Eiko can status heal (but now he is Slow. I...don't believe the team has a counter to this really?) 2 can attack.
Gilder can attack and then perhaps can get the jump and use Aura of Denial next turn (on Ephraim, since it's ST now). Evrae can get another status on say...whichever of Jessica or Alicia is slower is the obvious answer. Defender X is will attack the other one. The next Ephraim attack should get Evrae out of the way (Ephraim x2+Eiko+Jessica x2+Gilder so that should be fine, unless you see slow meaning Eph only gets 1 attack instead of 2 due to AS dropping). Team status...Ephraim is slowed and taken minor damage, Jessica is at 35% (Taken 1 attack from Defender X this round), Gilder is at full, Alicia is stoned (If Alicia can block now, switch her and Jessica). Defender X is at full. Next round...if Jessica status heals Alicia, she'll still be slow and Jessica will be killed by Defender X. So...there's some diceyness at this point. The key is that Eph can't ever take the counter (And Defender X's big attack and normal attack may get him too). It's quite possible to come out okay here.
Team Yoshiken vs. Kunino-Sagiri- We'll call Kunino 20 PC HP (32 unscaled by the topic). Let's assume everyone can heal up to full. He has time to kill Eiko and Jessica's MP pretty dead (Throw in Gilder for good measure?). He'll also get the 6 turns to control Ephraim. Kill Eiko, kill Alicia, kill Jessica. Hit Gilder, Hit Gilder,
? (Have Ephraim hit himself). Now if you scale Kunino's HP here, obviously they are fine. Otherwise, Ephraim is needing to hit a lot. This gets better if you don't see Ephraim killing the girls in one hit (Although they makes the last fight worse). Gut is that they get worn down here. The key to this fight is not running out of MP if you have a PC that can disable everyone else.
If Yoshi gets past this floor, I think next floor is probably the end anyways. He gains no revival (Jessica and Alicia are probably floor 5 at least), doesn't have AoD turn 1, and...next floor is where status starts coming into play.