Okay, fairly sure that Piggyman passes here.
Going to vote dungeon on Taishyr. That floor is pretty brutal, in fairness. Surprised when looking it up that Luc wants an earlier S1/2 form, due to the TWR lacking the cheap and fast casting full-heal. Plus, I'm not certain that Crowley is faster than Garnet, and that would spell doom if Rika is already dead and can't speed buff/debuff. The choice of Summoner is interesting for Carbuncle I suppose, which is pretty awesome whenever Bartz gets a turn and makes the team invincible... but if Rika dies vs. Luc, and Crowley dies vs. Garnet, then Yuna will presumably off Eiko in the last match. Shame, since if literally anyone was still left alive, they could probably force Yuna into a Dispel-lock while Tai's healer cleaned house.
For Team Commander... uh, this isn't nearly as much of a walk as some people think it is. Eirika goes first and doubles the entire team. If either one of her attacks is a crit (her rate is apparently 14.6%), that's bye-bye to the whole team except maybe Bowser. So call it a 25% chance of insta-lose. But yes, after that Cloud transforms her, and if he misses than Mime tries again, and Yuri heals up. (Though if both miss... Juan will likely trigger counters before the team has time to heal and then everyone dies after all, but this is pretty rare.) Don't know enough about the later fights, but some seem like they might be close, if say the Samurai can get off Death Sentence while Mediator / Chemist stall. I suspect he probably passes, but hmm.