From ESPN:
Tall, lean, fast and athletic and, Allen could project on both sides of the ball in college and has a ton of upside. Longer frame does hint of continued physical development and the addition of 10-15 pounds of bulk making outside linebacker his likely spot. Flashes very good range and pursuit speed on defense. Quick first-step and very good downhill burst allows him to pursue inside-out to the football and make a lot of stops near the line of scrimmage. Has the great quickness and instincts to beat blockers to the point of attack and the strong downhill filling strength to stack the run and hold his base. Would like to see him use his hands more when shedding. Strong tackler but needs to become more consistent as a wrap-up tackler and avoid leaving feet. Pursues with a high motor and displays good lateral quickness and agility when scraping off-tackle. Flashes good chase speed and acceleration needed to make plays sideline-to-sideline. Closes strong and fast but is a bit straight-lined and shows some hip tightness overrunning the ball at times and when trying to bend or change direction sharply. Could have difficulty breakdown and mirroring in space at the major college level and matching up with quicker slots in man-to-man coverage. Called upon to frequently blitz and pressure but does show good anticipation skills and breaking quickness jumping underneath routes in zone coverage. He certainly has the athleticism, ball skills and overall tools to mold into a a quality zone coverage linebacker and also match up with tight ends and backs in man schemes. Shows flashes of that athleticism on offense. An upright, slashing runner who can shed tackles and be difficult to wrap up when he gets his big frame running North. Has good burst out of his cuts and acceleration through the second level. Runs hard with a good a speed-to-power combination and has the strength to wear down a defense and earn quality yards after contact. Displays flashes of above-average outside speed but feel he is at his best when he plants his foot in the ground and gets downhill, square to the line of scrimmage. Has featured back potential if he can learn to run more behind his pads and continue building strength, power and explosiveness through his hips and lower body. Lacks great elusiveness and lateral movements when projecting as a major level back but can catch the ball out of the backfield, block and pound the rock with good strength and straight-line speed. Overall, Allen may have better pure measurables and tools than polished skill-set at this point when projecting as a RB or LB prospect, but this guy has a very high ceiling and impact type ability if a team is patient with his development.