The only reason I suggested Roy opening or 3 is that the rest of the squad seems pretty settled at the moment.
What the team is lacking is runs at the top of the order, to take the pressure off the likes of Root, Bairstow etc.
I am not trying to say the Roy should be a certainty nor can I vouch for his ability, as many others have said, his FC stats aren't the best, not is he considered a top order batsmen... But neither was Pietersen...
With the lack of cricket due to the weather, it may be difficult to choose a batsman for the next test series, looking at the CC top run scorers below, it could be anyone?
J Hildreth - Too old for selection now I would imagine. Has always scored runs though.
S Robson - Possibly in the same boat as Compton (I would argue Robson never got a fair shot)
S Borthwick - Seems to be the next man in line, got thrown in at the deep end for his test debut, has he improved? Only one way to find out.
J Trott - Only suggesting this because he is scoring runs again, surely can't be considered.
D Bell-Drummond - A name that has been mentioned a few times recently by Sky, surely too young to be considered yet.
As a side note, it wouldn't appear Bell is in much form so may not be considered.
Interesting times ahead for the test squad, the selectors under scrutiny again.