I have /so many/ thoughts on how everything can go wrong~! Sojiro not being a persona user means his memory isnt going to be 100% solid. Its going to be intense deja vu that leads to him alterting his choices with Ren and Taba! (For now)
BUT ALSO! Having a cheat code of NG+ means that hes gunna be a little weird. And kinda sus. Only Taba would know this. This will lead to some family stress of double-triple secrets.
(One day I'll make a whole rant on tumblr to you not confined by letter limit. Curses.)