The reasons you quoted are obviously a change in formation/tactics by Koeman.
You've also just summed up Bolasie's role to a tee there,
There is better,a damn sight better than him,that we can have.
Yes it is a change in formation but you still need the player to do his job and he did. Yes there are better out there but he still brings something to the team when its needed even if its just for being a disruptive nuisance. He battles for the ball and is like a little Gana up front. Much better option than DCL at the moment.