Make it so that teams must retain at least 4/5 of their original roster to be invited based on past season’s circuit points. 100T is a good example of why 3/5 is too less.
2>1. that's basic math, i get it. but, it also means in mid-season teams can only swap out 1 player. like, teams going through a rough patch might have to stick with 4 players in stead of 3 to compete in the season. the invite system is fucked i agree with that but, your proposed method restricts roster shuffling by a lot.