It seems the Cowboys really like Spencer, and if they want to keep him Irvin is the perfect player for Dallas. He could play as a wide 9 defensive end in nickle and be moved around by Rob in some sub packages. If he never develops the ability to set the edge, then don't ever have him set the edge. Dallas would be one of very few teams set up to do this. His value to us would be higher than most.
Spencer beat about 3 right tackles last year for sacks. One of those was when he was pushed 14 yards up field but Ware flushed a slow qb out of a pocket. If we add a good 5 technique in the first and Irvin in the late 2nd early 3rd, we have transformed our team.
The 2 best defenses last year were San Fran and Pittsburgh. Both of them are led by their front 7. We would suddenly have a catalytic front seven that is just a notch below. Our offense is better than either and we would be in a very good position to compete with the best teams in the league. Teams had an inordinate amount of success on Dallas picking on Newman, James/Brooking, and sometimes Elam in coverage. We have gotten ourselves to average or better at each of those spots, so the arrow is pointing up.