>>35591139Not necessarily. Like I said there, depending on how hard they're going for nostalgia, they could make this new trainer leave right after Red and Blue, so you'd get the same gym leaders and mostly the same Kanto as in Red/Blue/Yellow.
Red could appear as an npc for the big events where he's supposed to be there, like the SS Anne battle and Team Rocket's fall. Even for the Giovanni gym battle, the new character could just get stuck fighting Jessie & James like Ash in the anime.