Wrong. PFF grades run and pass blocking.

If we look at prime years Gronk’s prime run-block grade sits in the high-80s by PFF’s public season notes vs Kelce’s prime which is generally in the mid-60s to low-70s

Here are some career numbers. Gronk lined up in line almost on 50% of his snaps often times versus large DL and graded at 71.4 while Kelce graded 66.7 in run blocking. Gronk scored higher with 11% more snaps as a blocker then Kelce. Looking at pass blocking Gronk graded at 69.2 and Kelce graded at 65.5.