Montgomery is listed as being 5110 – 216, and he looks all of that. I wouldn't say he has great speed, but he has good play speed. His time will probably be in the mid 4.5s when he runs at the Combine. What Montgomery has is very good quickness and a burst. He is able to get to full speed very quickly. He also possesses very quick feet and excellent change of direction, balance and body control. He isn't a breakaway-type runner, but Montgomery gets a number of 15-to-20-yard runs. In only one game this past season did he have a run of more than 40 yards.
Montgomery shows very good vision and run instincts. He is more of a jump-cutter than a cutback-type, but he does show that he can cut back when the opening is there. Montgomery has a low running style, and he attacks his opponents on contact. He is not a move-the-pile runner, but Montgomery does consistently get yardage after first contact. His leg drive is very good. In the open field, he can make opponents miss with his quick feet and burst.
Where Montgomery excels is as a pass receiver. He has very good hands and does a great job adjusting to the ball. He is quick to turn up field after the catch and get positive yards. It is these traits that will make him a valuable prospect for the NFL, where he will be an every-down back.
The area where Montgomery needs to improve is with his pass blocking. He shows a willingness — and that is important in the evaluation process. But he needs to improve his positioning and hand use. He also needs to anchor a little better, which will come once he gets to the NFL level.
What a season it was for David Montgomery pic.twitter.com/I27NMthfj9
— PFF College (@PFF_College) February 12, 2018
http://www.profootballweekly.com/2018/07/30/greg-gabriel-early-2019-nfl-draft-breakdown-iowa-state-rb-david-montgomery/a5yxmkw/