He seems relatively happy at City maybe feels his chance at the true big time is gone he won't break into the front 3's of Barca or Real now, his best bet was probably Barca but they went big for Suarez instead of him off the back of his great season in 2014. Always felt the one thing that maybe kept him out of the very top clubs thinking was the injuries he'd always miss a big chunk of the season with injury, the move back to one of the big 2 in Spain seemed like the logical step for him when he joined City.
If he's happy to stay and compete with Jesus for that number 1 spot then there's little point in moving now, plus I wouldn't totally rule out them playing together in some games. Also, the fact they've got cover might mean he doesn't have to play every minute of every game so he can play the way Pep wants him to by pressing from the front a bit more.
I personally can't wait to see the back of him, I hate seeing City have the best striker in the league and he's been a complete nuisance to Utd in derby matches from the day he joined we've never been able to handle him.