I feel bad for Mo Ibrahim because he was such a good Big Ten running backs. A few thoughts:
In the past several years the Vikings have had several undrafted or low drafted running backs in training camp who looked good but didn't make the team and weren't picked up by anyone. What a shame. Good running backs are plentiful.
The modern NFL is pass oriented. And fast.
His prospect profile shows why NFL coaches maybe passed on using a draft pick:
All Combine and Draft-Related Analysis, News, Video, and Biographical Information for Mohamed Ibrahim
www.nfl.com