i said this at the start. both Thigpen and Cassell are incapable of anything but playing out of shotgun and throwing short passes. thats why they actually spent a 2nd round pick on a washed-up pass rusher and 2 inches of height.
Thigpen is a better decision maker and is has more poise in the pocket. hes also better at sensing the rush and doesnt take as many needless sacks. i think that makes up for his arm.