Here's Zierlein's commentary from NFL.com:
Pass-catching tight end with decent speed and plus ball skills but a concerning lack of consistent aggression in his play. Long is much too passive and unskilled as a run blocker at this point of his development to consistently help against NFL competition. He also needs to get better at controlling his catch space with body control and physicality. However, when the ball is in the air, he plays with a plus level of tracking and focus to make tougher catches look easy, including throws that are down near his feet. He doesn't look like a burner, but he does have success running the seam and working over routes, so play speed should not be an issue. He's unlikely to ever be much of a blocker, so he must learn to become more competitive and feisty in fighting for his space and the football.
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Now, to me... this sounds more like Shaheen, than Smythe, but this is just one man's opinion.
SI's guy said this:
Great size and catch radius with good build-up speed; isn’t a dynamic athlete but knows how to uncover, find voids in zones, and create enough separation in the short to intermediate parts of the field. He does well to find the seam and bend away from coverage against the middle of the field closed types of defenses as well as the middle of the field open.
A good pass-catching tight end with quality ball skills and only has five drops on his resume--several of them were against North Carolina in 2020. He does a solid job releasing up the line of scrimmage and bending around the covering defender with active hands that could be used more efficiently in conjunction with his feet to beat good press defenders.
He does a solid job running routes but isn’t overly fluid in and out of breaks which are somewhat rounded. He brings very soft hands to the table--hands that adjust and extend away from his large frame well.
He does a very good job making contested catches (outside of that NC game) through traffic, and he plays with a lot of concentration. A quality security blanket in the short to intermediate parts of the field for his quarterback.
He has enough speed, change of direction ability, and quickness to be trouble for some two down linebacker types in the NFL; he can also use his frame to box out smaller safeties and dictate the catch point with his solid play strength and long catch radius. He isn’t going to make many men miss in space with the football in his hand, but he brings good physicality to the tackle point.
He is a solid overall blocker with good foot quickness to mirror if needed in pass protection. He doesn’t overwhelm EDGE defenders with his play strength, but he has enough strength to hold up the point of attack as long as he keeps his center of gravity down.
He is more of a pass-catcher than a blocker, but he’s a willing blocker that is a bit more advanced than Evan Engram was in that area when he came out of Ole Miss in 2017.
Overall, Long is a top-five tight end in this draft who has quality receiving skills highlighted by his soft hands and solid ability to uncover in the short to intermediate parts of the field.
His build-up speed allows him to be effective up the seam as well. He’s a solid blocker who could still develop that area of his game a bit, not to allow defenders to separate so quickly on initial contact. Long should be a late day two selection in the draft.
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Both analysts say he has plus hands and is more elusive than you'd think. One spoke well of his blocking, and one said 'no', so it will be interesting to see where this goes. Either way, it looks like we are envisioning him as an old-school Y-type TE. If he becomes a plus blocker, then we will have a better Smythe, because he is a better receiver.