I think is being a little harsh on Bolasie. Every player takes time to settle in to a new team as well. He was very up and down in the little amount of games he played. Either way it still doesn't effect Ged. Bolasie may never even play again yet Koeman still sent him out on loan so I don't think the two are related at all.
Don't get me wrong, I think Deulofeu is talented like everybody does. It takes more than just pure talent though and I can easily see why he was let go.
I don't think he was outstanding either. He could be brilliant or a waste of space. He got to the point where if his first bit of skill didn't come off he would disappear for the whole game, you cant have passengers at the top level no matter how talented they are.
I actually agree with pretty much all of that (on a lesser scale) however some players just don't work hard, regardless of what's expected of them. Berbatov was the laziest mf I've ever seen saunter around a football pitch, and I would have had him at Everton all day.
Sometimes you just have to let the whizzkids do their stuff. Koeman just doesn't seem to want to.