The only RB to do it was Deuce who was a "special back" AND split time/touches with Reggie. The whole RB's can't get into a rhythm because of the SP system and how they are used is hogwash. Its possible but it requires a special back.
Ingram's YPC in 2013 through 2015 was equal to or higher than Deuce's YPC from 2006-2008. Don't know how you can objectively conclude that Duece was a "special back" and Ingram is not.
There's something about the way Ingram runs that makes people think he's less successful than other backs, but his YPC says otherwise. It seems his running style doesn't get him many style points. Fortunately, style points don't matter.