re: Caicedo playing right back, he had played there a grand total of four times at the end of the season, having never played there before in his career, including at youth level. He was an emergency option due to injuries to Veltman, Lamptey and Groß. If he were to sign for you, he would not be playing right back - inverted or otherwise.
My guess is the idea is we'd play the WM that is so hot right now:
Sancho------Rashford--------Antony
---------Mount---------Bruno-----------
------------Casemiro----Caicedo------
---Shaw--Lisandro-Varane----------
for example. So Caicedo is the RB when we defend in a back 4, but otherwise comes into midfield like Stones or TAA do. Caicedo would seem to have the legs to play that sort of role.
And when Casemiro or Caicedo is out it's probably just a normal 4-3-3 with Dalot or Wan-Bissaka coming in.
Put Rashford at LW and a new #9 up top if we sign someone better than Sancho/Garnacho.
Pros:
-Suits Shaw perfectly
-Lisandro gets to dictate the game
-Sancho might actually do well in that Grealish type role. Antony too.
-Mount or Eriksen and Bruno get to have 2 DMs behind them
Cons:
-Varane dragged out wide too often? Is KMJ mobile enough for that? We know Lindelof has problems in that much space.
-Malacia looked awful in the Shaw role today, though I guess we could just use Lindelof centrally and Lisandro in that role when Shaw is out.
-Is it a good fit for Rashford at LW? Might take him a bit wider and further from goal and suit a winger more.