The Beef: Oh, the catch rate of Culkin. Or what should also be known (in part) as the bad throw rate of Maty Mauk. If Mauk has improved his short and medium accuracy/touch, I would think the TE position stands to gain the most from that, and therefore Culkin may stand to gain the most.
As best I can tell, the coaches are pleased with his blocking skills, but getting more out of this position in the pass game likely needs to be a pretty big priority as so many new faces and hands are broken in along the WR depth chart.