Photo by Maryland Athletics

Height	Weight	Arm Length	Hand Size
6'6"	320 lbs.	Value

40 Yard Dash	Bench Press	Vertical Jump	Broad Jump	3-Cone Drill	20 Yard Shuttle
5.1 Sec	N/A	31.5"	9'5"	N/A	N/A

Pros 

• Exceptional size for the offensive tackle position.

• Great arm length to outreach edge rushers.

• Very good agility and mobility for the position.

• Good anchor against bull rushes in pass protection.

• Excellent kick slide in pass protection to ensure opposing pass rushers can't automatically get the jump on him.

• Can uproot pass rushers and prevent them from getting significant leg drive.

• Strong hands to lock onto defensive lineman and keep them from getting significant.

• Good leg drive in the run game when driving defenders off the ball.

• Excellent top speed when getting into the second level to makes blocks downfield.

Cons

• Footwork at the offensive tackle position needs considerable work. 

• Hand placement is poor.

• Too often loses hand battles with edge rushers.

• Very poor power at initial contact.

• Lacks that mean streak at the position to make a serious impact in the NFL.
  

• Bad at finishing blocks both in the pass and run game.

• Seems to quit on plays to early.

Overview

Watching Jaelyn Duncan on tape will leave you both in awe and disappointed at his performance because for player of Duncan's caliber with his size, athleticism, and physical traits you see a player that doesn't know how to use them to even average potential but also lacks that edge to him to make him at the very least a problem for defenders to deal with. He's got some of the best physical and athletic gifts in the draft and if his technique was at least average, he'd be a potential first round pick at the position. Any team that drafts him is getting the dreaded "project" prospect that needs a complete overhaul of his technique and play style and maybe a switch to guard if he can't live up to the position. If a good offensive line coach can work him and revamp his game, he could a potentially excellent offensive tackle at discount pick selection.