Define "feature back" in the context of the various eras. For example, Kevin Faulk was a second round pick who, in the absence of a Cory Dillon (also a second rounder) often received over 50% of the RB touches over the course of a season due to his versatility in a passing oriented offense.
Last year Spiller and Best were drafted as much for their receiving as their speed, neither could be said to be feature backs in the Adrian Peterson mold. Mathews was drafted by San Diego as much for his all-round game as his between the tackles ability. I suspect defining a "true" feature back for any one era, or even any one team, is going to be more challenging than any of us would like.
An "E" for effort, but it's lack of clear conclusion is not surprising given how a "feature" back for one team is a change of pace back for another. The more basic question gets down to the team level, in this case 'is Mark Ingram a "feature back" in the NE system?' 'Is Ryan Hill?' 'Mikel Leshoure?' Do any warrant a first round valuation when considering their roles (plural) in NE's system?
Ingram is a good 'move the chains' RB. He's not a breakaway threat. He's an okay receiver, and blocker. In short, he's not likely to be seen as a primary weapon for NE's potent passing offense. NE's O-line is not a drive blocking hawg line such as Minnesota, it's more of a zone/drive hybrid which would enjoy a Mark Ingram running, but not value him as highly for the greater percentage of snaps/game.
Is there a 225 lb, 1.48/10, 4.4/40, 3.90 ss, 6.8 3-c, 38" v RB with a four season annual average of 1,000 yds rushing, 500 yds receiving, 700 yds KR/PR in this draft class? Is he a patient runner who sets up blockers? Does he see the field well? Hold onto the football like it's his salvation? Durable? Regular in the choir, no arrests, punctual, gym rat, 3.0 GPA, etc? Oops, I think I'm in love, maybe fantasy football isn't so bad after all ...
Would Adrian Peterson be a feature back in NE? Behind this O-line? With his fumbleitis? Durability concerns coming out of college? I have my doubts. More properly, we should be looking for a "NE" feature back, because I believe that is what Caserio & Co. are doing. Danny Woodhead is closer to the NE ideal than some of us might like.