Ideally, he'd stay & play regularly but coming off a knee injury he isn't likely to get much playing time and these 4-6 months would be wasted outside of training with the team...He should play regularly to get his timing, fitness and confidence to where it should be for a progressing talent like his
With Villa, Tello, Alexis, Pedro and even Adriano or Iniesta, I just don't see how he'd get much of a sniff of playing time...Not to mention Deulofeu who will see odd minutes here & there..We're already lamenting how slowly Villa has been re-integrating into the rotation so my guess is that Cuenca would suffer a worse fate
Plus, I'm sure the club has faith in the player otherwise he wouldn't have been extended last season and it would be for half a season - by summer/preseason he'd be back ready to win his spot in the rotation