Sorry, but that's asinine analysis, or naive at best.It's Harry by elimination, not merit really.
AVB's problem wasn't players or tactics, he couldn't get the squad onside. His downfall was alienating players, he proved that at Chelsea where he had loads of talent.
Poch got a lot of the players he wanted, and he's proven at PSG that he can't win even with some of the greatest talent in the world. If he can't do it with Mbappe and Messi, why do we think he'd have done it here with Grealish?
Mourinho "properly backed" could have brought in some high priced names, but he proved at United that he was mostly past it. He continues this endeavor today.
Harry with a blank chequebook would've won us a couple cups I'm pretty sure.
In Redknapp's tenure the gap between the financially doped clubs and the chasing pack was not as pronounced as it is today, so any reasonable investment in fit and talented players as opposed to crocks and bargain bin has-beens would have stood a better chance .
Dismissing Poch using PSG as a metric is your biggest error, as the issues there are not down to managerial or footballing philosophy but having to build a cohesive unit out of players who have to perform carrying their agents and pr consultants on their backs, alongside their egos.
AVB was all about footballing philosophy and tactics, he was dire. His game plans made your eyes bleed and his use of players was like watching a mechanic loosen nuts with a hammer and undo screws with spanners.
Mourinho is a chequebook manager with the interpersonal skills and man management approach of a crocodile. His ego has outstripped his relevance.