I agree, a player selection banning would be totally unfair, as you would probably end up with just the original konoha 11 to play with and your main especially on a really active server.

Now if oasis came up with a restriction spin with 3 spins but out of your available ninjas (like wheel of fortune event) and the three ninja who it landed on got restricted to only 1 fight, then that would be better it would stop cancer, immortal and blitz teams being as effective. Yet it still give a little mystery as you wouldn't know who out of your opponents line up got restricted.