I called Grimble one of the most complete TE in the class because he's got the ability (and past production) both as an inline blocker, and a pass catcher. He's been a nice safety valve for the Trojans QB's ever since getting to USC. He runs good (not outstanding) routes, has very solid hands, has some ability at the catch point and plays well through contact. He uses is body well to shield defenders, and knows how to create separation and get open in tight spaces. He was a valuable part of the Trojans running game (might be where he's missed the most next year) opening up holes with his blocking, and using his athleticism as a lead blocker. Really solid player, and if you can get him in the fifth that's excellent value imo. He could be a more natural hands catcher, and his footwork through his routes can get a little choppy, but all in all he's going to give you a nice balance between a pass catcher and blocker.
Just watched what was available on YouTube on this kid. Big, strong and smooth runner from what I saw. Looks athletic. Surprised his name hasn't been brought up before. Obviously I only watched a handful of clips but I was impressed with what I saw.