At the time there were reports from Giggs and other coaching staff saying he had been working hard in training. The issues about his attitude that UIP mentioned were reported after LVG had left. There not gonna bash a player to the press while there coaching him. For one reason or another it's not worked out for him here. He has the ability no doubt, must be lacking something elsewhere.
Who knows? I mean you heard similar things being hinted about De Bruyne when he was sold and he has become a £60m player and the best in the EPL this season imo.
Mourinho's judgement on players has been very questionable recently. He sold off Mata to a rival club for not being able to defend and bought Fabregas! He completely isolated Moses who has been so good this season. He never gave Chalobah a chance even though he has not looked out of place at all when played this season. He continously played Ivanovic even though it was clear to my nan that he is a major liability. He marginalized best LB in the world Filipe Luis for god knows what reason.
Biggest mistakes were of course selling Lukaku and De Bruyne who have both gone onto become £60m players. Lukaku one was understandable because of off-the-pitch issues but I am seriously questioning the reasoning behind selling De Bruyne.
And look at his purchases the past 2-3 windows. The likes of Ibrahimovic, Pogba, Mhiki, Begovic, Costa and Fabregas were already all established star players so its not like he has discovered any hidden gem. Jury's still out on Baily.