The difficulty with this sort of appointment is you need someone who can transfer their skills to the PL and not be overawed/laughed at by better players. You don't want to appoint a Nathan Jones basically.
I agree with this. Plymouth are my 2nd club ( I was born there and moved to Liverpool 40 years ago ) and he is absolutely revered down there. Given their budget and that their best player has been missing for half the season it would be a remarkable achievement to get promoted ahead of Sheffield Wed , Ipswich , Barnsley , Peterborough etc. Absolutely no doubt he is a major managerial talent at that level even if he is a bit of a tinkerman when it comes to team selection.
However it would be a massive step up to manage Everton.
He may well be capable but it would be hell of a risk.
Personally I'd beg Potter to take over and offer him complete control.