I'm only on my 2nd evolution (assuming there's more), but it's pretty disappointing you can't invite Deryl to join in while you're gender bent at this stage. Like, you can eat the whole cake but not let a brother have a slice? Damn...
the max evolution level total is 5 the max the mc can get by the point the story currently cuts off is 3 and it is impossible to predict at what point in the unfinished story the mc will evolve again