Muttley
Gus Poyet
The "strange" thing for me is that those early successful signings weren't particularly expensive, some were outright steals, but even the one's that did cost a bit were way less expensive than some of those later failures and mediocre signings.
Don't understand where the friction would be coming from, surely Levy/the club should have been happy to keep going down a similar route with not massively expensive, mostly fairly young players. But that all stopped. Despite Pochettino being great at and seemingly wanting to work with (relatively speaking) younger players.
Everyone working together as a team is important. And of course the manager's needs should be important in that. But working as part of that team is on the manager too. The overall strategy from Munn/Lange (or Levy) has to match well with the manager's strategy too and the manager needs to be OK working within that strategy.
Klopp and Liverpool are a very good example of that. Another manager with a very good track record of both working with younger players and making a team of players more than the sum of it's parts (imo). Like Pochettino. Time will tell if Ange can do that at this level. His way of working was a very good fit for where the club was and what their strategy was when he took over.
Most of what we see and hear from Ange imo fits with where we are as a club, and how we seemingly want to go from here.
There's 2 or 3 areas I would identify.
The first is the sheer lateness of the deals each summer. I can remember a frustrated Poch talking about it. We all knew that Levy was pratting about rather than closing business and getting us off to fast starts each season. Levy piled pressure on his manager due to the lateness of the deals. His manager's pre-season's were hugely disrupted by this.
The second is whatever happened between Levy and Mitchell. Poch would know exactly what happened and was probably caught the middle of it. I'm guessing Poch saw the flaws in Levy running football ops, and perhaps the promotion of Hitchen was never blessed by Poch. Obviously, Poch and Micthell both moved from Saints and it felt like hiring Mitchell was Poch's request on Levy.
The third area is the subtle one. I'm not sure Poch wanted the same sort of signings that you describe above after the heights of 2016/17. I remember names like De Ligt, De Jong, Dybala, Fernandez etc. It's the cashflow model that I talk about. Levy was taking the CL monies and leaving Poch with zero net spending, and then posting world record profits. I mean, what manager would be happy after the chairman told the world that the stadium build and football ops were mutually exclusive and that the plan was to get CL when the stadium opened. Then Levy had the audacity to tell THST that Poch was happy with his squad and didn't want to sign anybody.
I think we have to remember that the weekly spokesperson for any football club is the 1st team manager. Poch did amazingly well talking proprietorially about our football club and defending his head of football operations. Doesn't mean he was aligned with him though.