On a side-note, I do believe that SE should split up these things. There are still a lot of minor CS that could be used to begin, and stick longer cutscenes at the ends. It would kill some immersion, yes (offhand thinking about the transitions at Nero > Gaius > Ultima Weapon x2 > Lahabrea) but there's no reason they couldn't show a cutscene as you leave, and then put you in a little room like they did for Ifrit and Garuda for setting purposes and put everything up until the transition to fight before it

Example meaning, after you beat Nero, you get his cutscene when you leave. It deposits you into a single room modeled after that room. You click the elevator outside of the instance, and maybe make the Gaius cutscene cut before he makes you that offer, and show that part at the start of the fight.

And for the love of the Twelve, make it four person.