Keith Jackson immediately came to mind. I remember us signing him and everyone saying it would take a few weeks until he was ready to make an impact. I think he caught two TDs vs. the Bills in his very first game.
Would Jim Langer count?
Jim Langer, Bob Kuechenberg & Manny Fernandez are the 3 greatest ever...but if you limit it 90’s on....Cam Wake, Keith Jackson, Ndamukong Suh & Karlos Dansby come to mind.