ENGLEWOOD, Colo. — The depth at running back this year is so great that some potential game-changing backs could drop into the draft’s third day simply because of the glut of prospects. As an example, ESPN’s Mel Kiper Jr. noted that Boise State running back Jay Ajayi — one of the sleepers that I discussed on Broncos TV– could drop into the draft’s third day. While I do not concur with that assessment — in part because Ajayi is not only productive, but could have the quickest feet of any running back prospect in this year’s class — the general point is true: quality will fall to the fourth through seventh rounds. Here’s a look at some players that might be available then. DAVID JOHNSONSchool: Northern IowaHeight: 6-1Weight: 224Notes: Listed at 215 pounds in college, he bulked up a bit and lost none of his speed — and, if anything, got faster. Timed at 4.57 seconds in the 40-yard dash before his senior year, he ran the 40 in 4.50 seconds, fourth-best among all Combine running backs. Johnson has an easy gait in the open field, and runs away from defenders — even though his long strides make it seem like he’s gliding. He’s outstanding at catching passes out of the backfield, and if he encounters a secondary defender in space, he often makes him miss. Johnson is one of the best size/speed blends in this class. The big issue for him is getting up to speed quickly; while he’s devastating in the open field, he needs to be quicker and reading his blocks and reacting upon taking the handoff. ZACH ZENNERSchool: South Dakota StateHeight: 5-11Weight: 223Notes: He might project to a fullback in the NFL if he adds some weight, but he fits the template of fullbacks that the Broncos favored in past years because he has outstanding skills with the football, both as a runner and a receiver. He’s also a willing, effective blocker in pass protection and won’t need too much coaching up in terms of technique. KARLOS WILLIAMSSchool: Florida StateHeight: 6-1Weight: 230Notes: It’s a bit odd to describe a Florida State running back as a “sleeper,” but Williams is an unusual case. When he gets uncorked, he’s perhaps the best size/speed blend in the draft class; it’s hard to ignore a 4.48 40-yard dash when it’s run by a 230-pounder. He’s smooth when running routes out … – Click Here To Visit Article Source