Where did I say ANYTHING about fighting the formers? I said they weren't going to be involved with it and the main reason the TV world won't be used for personas is because it will make them bring Yu Narukami, Chie, and maybe even Naoto. Narukami is a big problem in this situation for Joker/Scarecrow he specifically made it so there would be no ace coming in. 

You will get your persona by fighting a shadow form of yourself which will then be followed up by acceptance just like the people in persona 4.

Scarecrow/Joker is our Igor. WHAT and WHO he is won't be explained until the late factors of the roleplay if at all. Suffice to say he is as powerful as Igor if not more so. Whatever he is he is not human. Nor is he a shadow. He will awaken the potential of the people in his dream realm and be a narrator/mentor to the characters. He has not shown up yet in any form.