It's both, but Mykolenko is never going to play the balls Baines and Digne could.
Doucoure is never going to play balls that Sigurdsson and Rodriguez could.
Just ask Calvert-Lewin.
NDiaye is never going to be the player he could be while he has Mykolenko behind him - imagine Pienaar with Mykolenko behind him? Half the player.
Ultimately, there's not the pace, or craft in this team - there hasn't been for approaching 4 seasons now, which is why it's crucial we start getting recruitment right.