People used to say that about black QB's, too. Guess what happened when black people stated being chosen to play QB? They started to become some of the best. When the mentality (wrong) is to NOT pick a player because of height, or lack thereof, you're not going to be able to prove/disprove that height really matters. I mean, how many 5'10" QB's in the modern era have been given a chance? 2? Wilson and Flutie?