Jonnu's YAC/reception stats compared to some others...
Jonnu: 8.3
Henry: 2.9
Kelce: 6.1
Waller: 4.4
Knox: 5.7
Andrews: 4.3
Schultz: 4.5
Gesicki: 3.0
Pitts: 4.6
So he blows all the top TEs away in average YAC per reception. So he's very dangerous *when he gets the ball*. The problem is that he didn't get the ball very much.
Catch % of these TEs...
Jonnu: 62.2%
Henry: 66.7%
Kelce: 68.7%
Waller: 59.1%
Knox: 69.0%
Andrews: 69.9%
Schultz: 75.0%
Gesicki: 62.6%
Pitts: 61.8%
So he was a little better than Pitts and Waller in terms of catch percentage, two guys who I think most agree are, or who will soon be, among the best TEs in the game. But much worse than the other guys on the list.
But it's not like he doesn't present problems for the defense. Teams do NOT want Jonnu to catch the ball in space against them, because he'll kill them with YAC. None of the others is as good as him in that regard. He's barely targeted compared to these other guys, and I don't know if that's because he didn't play as much, or didn't run great routes (like it seemed to be his fault that he was in the same area as Meyers and tipped the pass), or was kept in to block more, or what. But while he certainly seemed to have his problems, one thing he excelled at was getting yards after the catch. So it seems like they could work to find more ways to get the ball to him.