Those guys aren't really relevant in a conversation just about Welker but I'd say Lelei was underrated and underappreciated by the Broncos. McCareins was a good special teamer himself but Welker was better. Neither of those guys were complete like Welker. That attribute of Welker had in no way, shape or form anything to do with Brady. And YPC may matter less than those other two metrics but 67 catches is not a small sample size and 10.5 is still nothing to sneeze at at all.
Completely disagree that he was "made" in New England. I know that's a popular opinion but that doesn't make it so. And like I said if the Patriots felt that way they certainly wouldn't have given up a second round pick for him.