Why?
If just one of them realises his potential then we have another superstar on the books. Why not get greedy and say 2 of them?
Too often we see posters on here bewailing us not getting a certain player before they became huge, only today we had BC on here saying that he'd like to see us getting the likes of Fofana before he became the £80M Fofana.
And he's right.
Taking these punts is kind of future proofing the squad. If they don't realise the hoped for potential, we move them on and hope to make at least a little profit on the turnover. If they do make it though, well that one player makes the whole thing worthwhile, even if we do have a couple of "failures" along the way.