I think it's far too soon for the boy to be moving on. He's still very raw and needed the old head of a Skippy to keep him on the right track. He'd have been much better off with first team football for another season at least.
Add to that that the current Leeds ownership is pretty sketchy and there will likely be a new manager in there 6 months from now who might not take a shine to Erwin, and it's a big risk.
Also, as I mentioned in other threads, disappointed he bolts at the first opportunity after we stood by him through 2 long term injuries.
But, we'll take the money, move on and see if he's one of those rare early transfers that makes a name for themselves.