I was all for Jason Allen first, because he is, or was the better player, easily a first round talent, but that hip injury just looked nasty (saw it for the first time in his yahoo! scout video). Its hard to envision him fully recovering from that. Plus reports are that his injured leg is only 85%. I don't really trust him with physical contact, and I am afraid he will get injured again. Hopefully for him, he is able to have a full career, but Ko Simpson would be the much safer pick for the Cowboys.
I also must admit, I wasn't a huge Pat Watkins, but he definitely seems to be the vest of the rest.