We are a few seasons into this universe and everyone who has submitted an application so far is a returning player who is migrating their applications from the former RP to this one. Not all of the characters you see are actual PCs and may just be NPCs or familiars, though your confusion is understandable and perhaps brings to light the need for clarification on the player's end of who is what. Also, I think the two PC rule is a typo and is meant to be three. 

Stats are generally negligible unless there's a big disparity between two given characters/monsters/whatever is relevant. With a few exceptions, fights generally aren't reliant on stat checks. 

But of course, Ari can go ahead and give you an official GM-sponsored answer, I'm just some guy being a dude.