Same story with any young english talent...
Eg - Wilfried Zaha. The Championships hottest prospect and he's English. Plays week in week out for Palace scoring and assisting them to promotion. Manchester United come in for him, buy him and don't play him. Six months later he is loaned out to Cardiff, so by now has left his home in London to move to Manchester and now to Wales to play in a relegation threatened side where even there he didn't start many games! To now being told by LVG he has no future at United... What a waste of a year for the young lad in what is an important stage of his development and he isn't playing and therefore we won't see him progress.
Take the German side, Julian Draxler of Shalke. Yet another German Attacking Midfielder wanted by Arsenal. Reports of massive money being rejected and they keep the player, playing him every week and he develops and featured in the world cup.
Zaha allegedly has a huge attitude problem. Schalke are one of the biggest football clubs in the World and Draxler would likely have been a starter at Arsenal seeing as he is better than what they have got. I get your general point buit these aren't decent comparisons.