To be fair, Brady also was dealing with a hobbled Aaron Hernandez and Wes Welker in addition to the loss of Julian Edelman in early December. Still the effect of losing the NFL's best tight end and most dominant red-zone presence cannot be overstated. Since he entered the league in 2010, Gronkowski leads the NFL in red-zone touchdowns (29), quarterback-to-receiver completion percentage (72.2) and yards after contact per reception (2.54).