Shame the lads has had his head turned and in my opinion is going for the short term financial gain, but as some posters have said previously, he isn't that good. He doesn't have the attacking quality required to be an elite full back. Mid - lower end premiership is his ceiling.
He is giving up a potential promotion, academy adulation, the club he supported and nurtured him for Palace, a club that will never be too far from relegation and will inevitably be relegated at some point. I would find it easier to understand if it was a club of a bigger stature.
Will be interesting to see how he gets on, wouldnt be surprised if he doesn't play much for the rest of the season.