It's a matter of opinion. I don't think Kev is as bad as you made out. Koeman seems to think the same.
Fair enough if you think Kev is crap. For me the like in McGeady, Kone and Niasse etc were far worse than him. You could say that on Del too he's talent but put in zero effort. Quite a few of them have zero effort, zero interest and zero talent. Our manager needs time to ship them out and he is doing it.
P.S come on you said Niasse had stolen nothing from Everton but you said Kev did? Not logical at all Niasse can't even get a game under the guy who signed him.