It's amazing to me how it just gets written that you can find a RB anywhere. The real issue with the position is longevity -- you're talking about hoping for a quality 6 year stint.
If we take the top 10 rushing leaders from 2015, we have 6 first rounders, a third, a fourth, a sixth, and an UDFA.
Raw yards are obviously limited, so what if we want to go by Rushing DYAR with at least 100 rushes instead? Four firsts, 4 seconds, a third, and an UDFA.
What if we compare that to the top 10 Passing DYAR totals? Five 1sts, 2 seconds, 2 thirds, and a 6th. Doesn't look much different, does it?
If you like Elliott best of the guys on the board, you take him unless you're not planning on competing in the next 6 years.
Tell me which of CJ Anderson/Ronnie Hillman, Jonathan Stewart, David Johnson, James White, Alfred Blue, Jeremy Hill/Gio Bernard, Matt Jones, or Thomas Rawls makes you think that with as many holes as the Eagles have that they should take Elliot with their first pick?
You don't need elite RB's anymore to win SB's in this day and age. Unless you have some combination of an elite QB and/or elite defense, you don't win the SB.
Running backs by the last 11 Super Bowl winners:
2005/2006 season - Willie Parker (Pittsburgh Steelers)
2006/2007 season - Dominic Rhodes (Indianapolis Colts)
2007/2008 season - Brandon Jacobs (New York Giants)
2008/2009 season - Willie Parker (Pittsburgh Steelers)
2009/2010 season - Pierre Thomas most yards, Mike Bell most attempts (New Orleans Saints)
2010/2011 season - Brandon Jackson/James Starks (Green Bay Packers)
2011/2012 season - Ahmad Bradshaw (New York Giants)
2012/2013 season - Ray Rice (Baltimore Ravens)
2013/2014 season - Marshawn Lynch (Seattle Seahawks)
2014/2015 season - Shane Vereen , though by committee (New England Patriots)
2015/2016 season - CJ Anderson/Ronnie Hillman (Denver Broncos)