Right back options for first 20 games of the season would be Coleman, and Holgate should Coleman get injured, or Lennon as a wing back. Then as I already mentioned, recalling Kenny would always be available.
Centre back options for next season are Keane, one of Williams/Jagielka, Mori plus the new centre back we'll surely sign. That's four CBs excluding Holgate.
Plus we'll have Baines, Garbutt and possibly even a new left back. Next season we have no excuses or reason for being exposed like this.
For me it all depends how Coleman comes back. Until his injury he was extremely reliable and pretty much never missed a game. I don't see the benefit of keeping Kenny sat on the bench just because Coleman *might* get injured. If loans can be recalled, I see absolutely no down side to that.
Since when do teams rotate their full backs? I see Kenny being phased in as first choice in about two years, possibly even three. Once we're back in Europe, then is the time to keep him and use him more. I desperately hope that could be next season, but it appears the gods are against us giving us Chelsea then the RS in both cups.