I'm going to say Zed, although I hope that you still eventually pick him up and learn him.
The reason I would eliminate him is not because he isn't good, but because he tends to be better in other positions, ... well, okay, one position, mid.
Your team will benefit better by having him in the mid lane because he is good at roaming top and bottom to assist with applying pressure to those lanes. In the top lane he will more often be stuck farming against a tank.
Then again, there are always TP plays, but you are still limiting yourself by a pretty long cooldown and requiring that you have great map awareness.