Pogba needs to go.
Matic the same.
Slabhead needs to be gone a year ago... Tactically naive and massively poor decision making.
Henderson.. He's got to be challenging for that number 1 Jersey.
Martial. Glimpses of decent play, but too little too late.
The passing of the ball.. I've not seen so many intercepted passes in one game. Fred had a nightmare, every time he passed it went to the opposition.
The points you make could well be correct and the cogs of a machine do need to work smoothly and mesh properly.
The question I would pose though is are there fundamental problems with the club at higher levels? If so then they must be addressed as otherwise to think that making changes at a lower level will bring success is very naive.