Once RR gets the on field tactics right, he will ensure that the squad will take shape naturally; the whole point of having cover for every position is that when one players' form drops he gets replaced. Too many players under Ole had poor games and continued to play, or were left in place so he could fit others in elsewhere.
AWB and Dalot are not natural cover for each other at RB. AWB is a better defensive player, but struggles at wing back and in an attacking role and Dalot is the opposite; whereas on the left Shaw and Telles are much closer in that respect, although neither (in my opinion) are from a positioning standpoint, that good at defending.
If RR is going to continue with the 4-2-2-2 formation, it has to be Telles and Dalot.