There are rare occurrences in which a RB prospect who can play on all three downs can be available outside the Top 20. This year, Kenneth Dixon looks to be the guy. Dixon has plenty of production as a runner as Lousiana Tech and offers tremendous value at the next level as a legitimate receiver. In 2011, the Patriots drafted both Shane Vereen and Stevan Ridley to be their 1-2 punch at the RB position. Both players worked to a degree, but couldn't be on the field for all three downs due to their flaws. If you superimpose the skill sets that both RBs bring, you get Kenneth Dixon.
Dixon isn't fast nor has great straight-line acceleration as proven by the 40 and shuttle drills, but he is very good at changing directions on a dime. Dixon was only 1 of 3 RBs in the combine to register a 3-Cone time under 7.00 seconds with a 6.97 mark. The 6.97 mark is a bit slower than what the Patriots typically like out of their RBs, so it wouldn't surprise me if they passed him either. This RB draft is more of a committee type draft, so the odds of finding a dominant 3-down RB is low unless you have a Top 15 pick and like Ezekiel Elliott.
The Patriots offense is at it's most dangerous when the Patriots can keep the same personnel on the field yet be able to change the identity of the offense on a given play. An example of that is an empty backfield formation with 12 personnel. You're running the 1999 Rams offense with a personnel grouping more consistent with the 2004 Steelers offense. In the NFL, predictability is a weakness and teams will exploit it. Having Dixon on the team would allow for the Patriots have both the threat of run or pass based on how the defense lines up and what Brady sees when his offense lines up.
The biggest problem for Dixon is mileage, pass protection, and fumbling issues. Dixon had 889 touches at Louisiana Tech, 801 rushing attempts and 88 receptions. On those 889 touches, Dixon fumbled the ball 13 times which is too high. As James White said two years ago, "Ball security is job security". However, his issues can be fixed after a summer with one of the best RB coaches in the game. I see Dixon as a "If No One Else is There, Why Not" pick at 60.
For an extra trivia fact, Pro Football Focus compares him to Patriots RB Dion Lewis, although Dixon is about 2 inches and 15 pounds heavier than Lewis.