If he really was over ruled on every aspect of football then why offer him a 3 year deal? And if he really felt he had little say with managerial signings and most transfers, then he should have seen the dire consequences of his remaining a 'Yes Man', and hence declined the new deal in search of self respect.
This is a 50% Moshiri and 50% Brands disaster recipe we're in, but of course the owner cannot be sacked.
If he believed Carlo was appointed way ahead of it's time then he should have not signed the new deal.
The DoF and Manager clashes are not uncommon. The least he could have done was try and define what identity we want to follow as a footballing brand and try to sort out the academy accordingly, then try and recruit players that align with those philosophies and convince the board to deploy managers that support that brand of football, be it a Benitez, Ragnick or a Potter.
In 3.5 years he's been here, he only had his hands tied by FFP once, his signings except Richy have been highly injury prone, unsuited to PL or simply gash in terms of Kean, Delph and Iwobi. In 3 years, he could not find a back up RB, decent back up LB to give Digne heat, decent ST who could score consistently. Rather, he kept on relying on DCL and when RIchy's decided to sulk for past 2 years and DCL became injured, he has nowhere no answer either.
Ultimately, he's a victim to saying 'Yes' to the board, 'Yes' to Carlo and his James experiment.