Clever thinking to give Long a runout at LB. He could be essential as utility back 4 cover this season, so getting some minutes there early is really good. Will presumably also provide defensive cover to Osei Yaw at LW, who may need to be covered - is he used to playing on the wing? I thought he was brought in more as a striker? CM is very lightweight. Will probably work against a team of U21s but doubt it would cut it in L1 (not that it would need to, though, I suppose - it's very much a 'last resort' lineup in that sense).
Overall, looks like the fixture is being used sensibly and creatively by KR to get minutes in legs and try out some old faces in unfamiliar positions.