I'm guessing we'll see a story arc of Team Evil making their way through part of Serini's funhouse, with the point being MitD character growth; he will be given a few lessons in how Xykon and Redcloak really don't care if he gets hurt / suffers pain as they use him for Barbarian Trap Clearing - "walk straight down this corridor and trigger all the traps". Grayview will have some sardonic observations about that being just how life is, and Oona may offer some comments on how MitD's monster type has certain immunities or resistances, which will get the MitD identifier crowd all in a tizzy.

What we'll learn is that TE is making their way through, slowly, and that MitD is being slowly prepped to switch sides at a suitably dramatic moment, probably the final battle.

If the final battle is to take place at the final gate, at some point TE has to realize they are being tricked.