Excellent man of the bench performances! In all seriousness, I think he'll get a good run in mid-week EL matches with Lindelof, Shaw, and AWB.
If it was possible to train the usual suspects into a second tier back 4 and play only for their strengths, then that would be hell of a rotation in football history. Other teams rotate goalkeepers between league and cups, we are able to rotate our whole back line... but if it works, then it'd be amazing.
We are stuck with these goons (Lindelöf is the most decent one out of the 4), so the best we can do this season is to drill them into a 2nd unit and focus them only on non-league games. But the question is, how should our gameplan look like then? This is a low-block team, lack of energy etc. So, maybe a counter-attacking, ball-hoofing tactic can bring some success? I can see McTominay, Elanga, Ronaldo, VDB, De Gea (as Dubravka is more of sweeper keeper, suiting ETH) and Rashford joining them.
So, in an ideal world we'll have a 2nd team of
---------------De Gea
AWB-Lindelöf-Maguire-Shaw
------------McTominay-VDB
Elanga-----whoever lacks match fitness--Rashford
------------------Ronaldo
Play counter (excellent for Elanga-Rashford), long balls,, lots of crosses (Shaw can cross and McTom, Maguire, Ronaldo have decent header in them) and just try to win the game. That would be superb for team chemistry and everybody gets their minutes.