Statistically, if you look at the history of the Euros and World Cup, only one time has the winning team had a foreign manager and that was Greece when they had the German Otto Rehagel. So having a foreign manager does not matter really.
I think the key is having a manager who speaks the language clearly and passionately. You have limited time with international football players and so the language barrier cannot be an issue. Then there is the passion but sometimes that also brings fear so that might be an advantage with foreign managers who would not have that. At the end English managers do not tend to be very tactical/technical. For example, just listening to the Crystal Palace manager at the end of last season and his post match interviews you can tell how he understood the tactics etc. (similar to how Klopp, Pep sometimes speak) whereas you dont get that so much with English managers. I think Steve Holland was the tactics with Southgate's good man managing and leadership.
I think Potter is different and he can speak as well as Southgate but is levels above him (and I would say Howe too) tactically. Howe in big games goes very defensive.
The 5 step plan for England to win World Cup in 2026:
- Select a tactical/technical manager e.g. Potter.
- Find a number 6/DM who can play the ball and give it between the lines i.e. Not Rice.
- Find a pacey left winger who can get goals.
- Let Palmer or similar creative player to play No10. Not sure Foden is that type of Odegaard/KDB/Fernandez type player.
- Get a GK that can play the ball. (Pickford has been good with his hands but there is a World Cup to win).