Lols who is Trevor Henderson? Usually people ask 1st before posting other's work lols but no worries, just add Trevor to the game's proceeds and he will make money while you await to ask him, put it 50/50 for now unless he asks for higher pay, also giving others work away for free without asking not good morals, I think you can add people to projects, almost 99% certainly sure you can tbh! Cheers! :)