tl;dr pure conjecture
I think its completely possible that funimation is funding Casey, or at a minimum telling the Soye's to delay as long as possible for the "company that helped them stand up against the predator" etc. If Funimation is funding Casey it makes sense they would tell him to stall until they get their house in order to respond to this suit. It would make even more sense they would tell casey to use up as much of vic's warchest as possible as the more money he has, the greater his ability to nail their ass to the wall going after them.
Its also possible that upper management sees the writing on the wall like Nick did in his initial video where he said "Sony might see this shit, fire everyone, and settle!" If that is the case, and they aren't as stupid as we think they are, 90 days is a good amount of time to suck as much value out of Funimation as they possibly can for themselves. At the very least 3 months notice to getting shit canned is nice.
Also the "my clients are full exceptional individual and its easier to make as much money out of litigation as possible" technique by Casey is not without its merits. If you where a lawyer, straight up told your clients "Not allowing deposition to be private is a death knell for your case, you need to stop sperging on the internet, we're in trouble for reals!" and they responded like we all know they have, what would you do? You know when these guys get disposed they're potentially going to realize how fucked they are.
Drive that bill up, replying in a non obnoxious manner is rookie numbers.