Clearly Mancini decided that RSC is not at the level he wants from a front player, and that at nearly 30 he isn't going to improve. Maybe he thought that giving the much younger Jo some games would be better for the future of the club.
Heard a rumour though that RSC hasn't been used due to clauses in his original transfer contract from Blackburn, ie the more games he plays the more money they get.
Apparently the original transfer fee was far off from the reported £18m, more like £8m with bonuses for appearances. This would make sense given his injury record.
The theory might have some credence apart from the fact that 1) our club doesn't have a money problem and 2) his seeming rival for a starting position was Jo.
So he should go to Blackburn on loan until the end of the season, they pay his full wages, then buy him for whatever the original transfer fee was if he keeps them in the Prem - less depreciation for mileage. Fair?