I don't get why so many think Rose is some huge deal. He won the league in Austria with one of the richest teams in it, and won a German Cup at Leipzig, who are also a big and wealthy club. Otherwise, though, he has won nothing and his spells at some of those bigger German clubs were cut short by sackings or mutual partings after underperformance.
I'm not saying I would have objected to his appointment at Palace, but if he is indicative of the best of the candidates that we could have tied to a contract early, then I can understand Palace waiting to play the game a bit.