I don't really understand the Brahimi stuff and they do actually seem to be more than a rumour. After doing a bit of research on him, his best and preferred position is left wing.
He can play a few different positions but that is apparently where he performs best.
The exact same can be said of Bolasie. Can play any attacking role, but his best position is left wing. Why on earth would we spend 25 odd million on Bolasie and then sign Brahimi for 30+ million?
Seems an odd one to me.
Whoever has played as the 3 behind lukaku have seemed to interchange at times during the game so maybe koemans idea is that getting players who are versatile alows for more of this,even if it means not being in their primary positions for the entire game. Just a thought mate.