I think JL didn't like Houston players because most of them were pretty much useless when he was here anyway.
The ones who showed ANY signs of life usually got brought up and had some degree of success ala Voros, Scott, Veilleux, Dupuis etc. It's just that DR was so poor at finding decent talent, and even worse at developing it, Houston players weren't offering much across the board.
I mean, look at some of the other Houston names DR tried to shove down JL's throat such as Travis Roche and Matt Foy!