Im not so sure about that mate - Everton has some weird culture where new signings and managers automatically turn dross.
Koeman had Southampton playing some very good stuff - comes here and we didn't look anywhere near the same level and was helped a lot by Lukaku being on fire that 1st season.
Silva had Watford playing great stuff (and has Fulham playing good attacking football) yet look at the difference at Everton.
This squad are incapable of stringing 2 passes together and any manager who comes here is resigned to the same fate as the last half a dozen imo.
Koeman took over a Pochetinho side at Southampton. He improved us in his first season. The issue was the spine being ripped and him spending £300million and playing worse.
Silva had us playing good football...he just couldn't defend and didn't have a striker. So when you can't score and you leak goals, knocking the ball around adds to nothing. Again, sacked as a response to spending a lot of money to not improve.
Additionally they were sacked due to the basics. We were shipping 2 goals a game under Koeman and Silva before they were sacked. Ancelotti knew this. Even Big Sam knew it. Both came in, stopped us leaking goals. You take next steps from there.
It's walking before you can run. Of course Potter would struggle...but I think he's not a stubborn manager and can also set up a side to defend. If you're doing a rebuild, you still have to get results but slowly move into a direction you want.
The issue with Benitez is...where is he going? What is he doing? Hes not showing a blueprint.
If his blueprint is how he's set us up now but needs better players to pull it off, it's not good enough because you're not going to change a whole 11.
His faults are on the pitch. Yet he'll blame everything and everyone off it.