Welker is a great system guy. Notice how his numbers skyrocketed once he worked with Brady. The broncos are one of the few teams in the NFL (maybe the only other than the patriots) who has a great system that he would thrive in. Welker should WANT to come here, especially so he could stick it to the hoodie.
I don't know if his value at a 8-9 mil salary per year is better than a guy like collie at the veteran minimum. I'd be excited if we got welker, but it seems to me safety and running back are more pressing FA needs.