I know it sounds bad, but I do think we would ruin him.
Our coaching is so abysmal, most players we buy in, come in firing on all cylinders and a few months down the line, they turn to crap.
Wan Bissaka was so good when he joined us - look at him now.
Pogba was great in his first season with us and since then he went downhill. Today he was abysmal.
Baily was pretty good when he first joined us - he went downhill (although he is has been playing for us for the last few games).
Darmian - great player when he first joined us, then went downhill fast.
Miki - great when he joined us (remember that scorpion goal?) - then turned to absolute crap.
Sanchez - after one training session with our team asked if he could go back to Arsenal. Goodness knows what he saw at the first training session that made him think that.
Depay - when he joined us he was full of promise. Then he turned to crap.
Lukaku - his first season was decent, then he put on a lot of weight. IMO, he was obese when he finally left us and after joining Inter is back in shape.
Maguire - when he first joined us he was our best defender. Now, he is pretty average.
I could go on, but you get my drift. We destroy players and the most likely reason is poor coaching.