there are 2 problems i can see happening so far with the game and creating new heroes:

1- as you may have noticed, somee players bought alooot of event chests and got there pete/monkey/wendy/pumpkin alot of EP's however, sooner or later those EP's will fall back, since you cant get them back again, so here is what i suggest, if you own any of the new heroes, their gears become availalbe int eh normal chests after a month or 2 after they were unlocked.

2- you can never create a new main DPSer with the current meta, i mean why would i ever use wendy, when i have a hermit that has over 100 EP's? thats a throw back for me, and i would never consider diversity, so here is my other suggestion, when unlocking a new crusader, calculate the average EP's of all your crusaders and give it to that new hero that you have unlocked.