I think playing at RB has really helped him and for me that's his best position currently, as I think his attacking game is underrated - as he has shown a few times this season. I feel Carragher benefitted playing full back, after initially struggling at CB, before moving to become the CB we remember. It can be a good position to learn and gain experience for a defender.
If he plays CB, he is certainly going to make mistakes. But Lovren, who you'd have thought he'd be replacing has been doing this regularly, so we won't be in a worse situation really. But ideally he'd be coming alongside a CB who will take the pressure off him, like a Van Dijk, who can deal with the physical or oppositions star striker.
Lovren is our most physical CB, despite his size Matip is pretty passive and not the presence he should be. If Lovren goes out of the side, then Matip is really going to have to step up and take more responsibility if Gomez is alongside him. He needs to be more vocal, more physical, imposing and being the leader we hoped he'd be when we signed him.
Clyne coming back will reduce the pitch time for Gomez, so with Lovren really struggling it makes sense he gets a chance at CB to develop, learn and it might really pay off in the long term for us. But we have to accept he's not the finished article, he will make plenty of mistakes and it's not the easiest set up for a young CB to come into.