ARURF suggestion
When someone else dodges, give the player the option to keep what champion they had selected before the dodge. It'd save a lot of frustration imo. As for the situation where two people have the same champion, maybe give a heads/tails option or something.
There's no telling how many times I've gotten a champ I've been wanting to play, only to have them stolen from me due to a dodge, and then get someone absolutely no fun to play the next game that I've been seeing for 20 games.