If your main isn't able to come back for Smash 6 or be a permanent mainstay, what if he/she comes back once every 3 Smash games? He/she wouldn't be in Smash 6, but he/she would be in Smash 8, Smash 11, Smash 14, Smash 17, Smash 20, Smash 23, Smash 26, Smash 29 and so on.