No doubt Erwin went there for more money, and he might be disappointed that he's not getting any first team action. That doesn't necessarily make it a bad move for him though; at a club the size of Leeds he'll still be benefitting from better facilities (and arguably better coaching, given our current predicament) than we could offer him, and whoever he ends up being loaned out to could still be playing a higher standard of football than a bottom-half Scottish Premiership club.
It's the guys like Tom Hateley who give it all the "bigger challenge" chat and then struggle to get a four month deal at Tranmere Rovers that I'm more inclined to reserve my "telt ye's" for.