I captained Kane in GW1 and he got me 3 pts. Dumped him, and he's since returned in practically every week (in FPL he did in every).
I think I'm unbiased when I say, "He can go to hell".
Seriously, LEI are his bitches, so with their current defensive record, he was always going to get something.
Every other team he's played has also had serious defensive issues.
He's now playing some of the best defensive sides, so big returns will be much harder.
I think if you've got Mitro or Kane, you hold, but moving to the other is likely a wasted transfer.