If we think about Potter and the way he plays, his last / best line-ups when he was at Brighton, I don't think our squad or best team looks too bad in comparison really but there are obvious glaring issues that would be the case under any manager - wing/full backs.
Something I liked about Potter is that he doesn't just stick to the same formation each game but would adapt so you'd see him play 3 or 4 at the back depending on the game.
Let's take this for example. We have a better keeper than Sanchez in Pickford. We have a better version of Dunk in Branthwaite - a tall strong, dominant CB who is adept with the ball at their feet. Tarks taking the Webster role and JOB with the Veltman role (Branthwaite and ___ being the Dunk/Webster in a back 4).
Garner to be that Caicedo type player who has both physical and technical attributes (worry is fitness) - Gana back up to that position.
MacAllister - we don't realy have a player capable of this.
Trossard and Groß - Ndiaye and Lindstrom for now. Ndiaye covers that Trossard role well I think. Lindstrom is a doubt but i do think a Potter style in that formation is his best position. Based on his performance so far though and our issues we obviously need a new RW/RF.
Welbeck - Broja. A technical forward who is capable of doing things with the ball at their feet and involving the players around him.
Estupiñán + March - These are unfortunately the positions which, along with that MacAllister position is a glaring one, especially in a Potter system as they are quite vital. Perhaps you could get away with using McNeil and Patterson initially in those positions but they'd also need upgrading.
It's not....great...but I don't think we are SO far away from having a squad that Potter could work with.
(This is not meant to be taken as a these players are an exact like for like or of the same quality - there are obviously players like Caicedo who are far better than any CM we have).