Greene, Daniels, Wadley were all either 2* or 3* kids. It doesn't take a 4* RB to be a good RB, Iowa will be just fine at RB with or without Eno.
Beau was a 2* kid when we offered and most were like "he will be a TE at Iowa". He isn't a difference maker like Holmes would be.
5 years ago I would have agreed with this. But we watched a fullback run the ball for 3 years so I'm not so sure anymore. Also Wadley reminded me of the difference between a really good back and a serviceable one.