Perhaps you're right about the foot and it wouldn't be so obvious were he not taking 5 left foit touches to turn round on the wrong side.to be fair on a basic level I'd say loads of players are as one footed as him. The issue is that he invariably plays as a winger and has absolutely no pace whatsoever so he often finds himself in positions where he has to go onto his weaker side and it's then that it becomes painfully obvious that he can't do it. Players who have pace and are able to continually go past on the outside you don't notice as much, and defenders can hide it a bit more easily, but playing the way he does it just stands out like a sore thumb (obviously exacerbated when for no reason that I will ever be able to understand, managers actually play him on the side that he can't use).
As bad as playing him on the right is, it's amplified without overlapping FBs
If he starts tomorrow it would be so much more effective if he were left, Ndiaye right. At least DM could get the occasional early cross in and we know Ndiaye can dribble past his man