I just want to see the last 5 champions I've rolled eliminated from my pool. For example ..
Game 1 - Ziggs, Game 2 - Nidalee, Game 3 - Sona, Game 4 - Maokai, Game 5 - Lee Sin.
During games 2 through 5 I would not be able to roll Ziggs again, trading for him would still be possible but would reset his "timer" in my pool. In my 6th game he would become available in my pool again. Same deal for the rest just pushed another game over.
I just hate that I own all, but maybe 6 champions and I can roll something 3 games in a row.
I'm in the same boat as you thinking they should all be unlocked, but Riot won't ever do it so they could at least do something with the system.