Well, checked the stat topic, and Zophar does *not* have an above-average speed OHKO. He's got 340 damage to a 370 HP average, or .919 PCHP. Of course if you give him his hands... well the two hands which aren't destroyed in the warm-up portion of the fight... he has his OHKO anyway off their damage, but the hands damage is "faster than Ronfar." So... somewhere between 89% and 115% speed if speed is taken literally, except a bit worse than that since you have options for stat-boosting in-game that the DL average doesn't include.
Zophar's status option - which denies him the big damage - says:
Status Ball- 80-90. Can Silence, Poison, Paralyze, and Confuse. Faster than Jean.
Anyway there are only two teams that have a chance in hell here:
Jowy Atreides and Tengaar (Suikoden II) vs Zophar (Lunar: Eternal Blue)
Actually, spamming Canopy Defense here is pretty cool, since one of the best ways to beat Zophar in-game is White Dragon Protect abuse. The only problem is that despite the Canopy Defense speed hype from Jo'ou, Status Ball is still faster than Jean, and might outrace it anyway. If it does, any of those statuses other than Poison are trouble. I suppose with sufficient Zophar HP disrespect you can hype Jowy as 2HKOing anyway, but then the second Status Ball heads for Jowy. So no, Status Ball faster than Canopy Defense -> Zophar win. If we grant Tengaar the speed break... well, auto-win if you hold Zophar to just one part. Unfortunately I don't, so the hands break Canopy Defense, then Zophar's main body overkills Jowy with the slow nuke.
Ryudo and Millenia (Grandia II) LOSS vs Zophar (Lunar: Eternal Blue)
Millenia has .955 PCHP. As noted, Zophar's fast good damage does .919 PCHP. However, Millenia's MEN is trash. Uh... how much does G2 MEN matter? It's possible she might survive if endgame G2 defense statistics are meaningless enough, which is quite possible! Anyway, Millenia needs to survive that. If you hold Zophar to one part, sure, G2 victory if she does. With his parts, Millenia also needs to outrace Zophar's hands' "faster than Ronfar" moves. Millenia is ~94% avg. speed, which is on the low end of the potential range of "faster than Ronfar." Still, if she gets a turn, I'm pretty sure SBE disables all the *parts* of a boss too, not just the main part, so collect victoly if it goes off. Anyway this team is the closest to winning, so I will make this a respectful abstain.
Looking back at the original batch of Heavyweights, the only other team that maybe sort of has an interesting match is the eliminated Alexia / Clarissa. If you force Zophar to pick his status target blind, then Alexia snipes it 50% of the time with her ST status-immunity initiative move, and occasionally the status is POIZN anyway. If you also hold Zophar to one part, then Clarissa hopes to get a continuous stream of Rob Turns while Alexia like 4HKOs with Revolver Sweep. Unfortunately Zophar just kills Clarissa on turn 1 instead, and Clarissa's HP is worse than Millenia's, so she doesn't really have an argument to maybe survive.
Zophar sweeps every team not discussed above.
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Fun tourney, by the way. I'm always a fan of team tournaments. My only comment is that failure is funny and in general I'd prefer keeping everyone in, even if that meant cutting down the total number of teams. The 'bad' team that nevertheless sneaks in one random victory is still pretty neat.