I dunno, I read in NP that they were "straining their character design" or something similar to that, so maybe 50 bosses isn't completely off the wall.

Especially if let's say number 50 is actually a sort of sucky assassin and a very generic fight.

And maybe some of the bosses will ally with each other, so it won't really be 50 fights, but 50 characters. And let's say there are a a fair share of of boss-teams, let's say 2 3-man groups, 4 2-man groups, something like that, then character design isn't so hard.