Injury, not age, is the thing holding Kittle back. He remained dominant at age 32, with 57.1 yards per game (second among tight ends), seven touchdowns and 2.39 yards per route run. San Francisco posted a 138.4 passer rating when targeting Kittle, whose 82.6% catch rate was stellar. “Injuries and durability are becoming a concern, but when he’s healthy, he’s still the most versatile, dominant, complete tight end,” an NFC executive said.