If Tudor picked his best eleven with everyone fit then I think this would be what it is based on defensively. He will play 3 at the back, given a choice.
Vic
Romero, Danso VDV
Palhinha
He can now play 4 out of the 5 in their right positions so that is a must for me. Then Porro/Spence at RWB and Souza as LWB. My only compromise is unfortunately with Gray. I think he has to fill Romero's position until the skipper is available again. We ideally do not persist with Dragusin in his current form.
If I take your logic then perhaps 6 are locked in
Vic
Romero, Danso VDV
Palhinha, Gray
I'm just not sure how we find a replacement for Romero until he is back. Playing Dragusin in that key RCB position worries me a little. Even if he defends well, he's not got the ball playing abilities. A left field choice would be Dorrington but that isn't going to happen. Another could be Spence if he's fit again. We've seen him briefly play there earlier this season. He's definitely got the qualities on the ball.
I do think Tudor's dilemma is wanting to play his chosen system vs putting players in their rightful positions. He had neither in the Fulham game.