Gaskin was very productive in college. Ted Slim predicted he would be the most improved Dolphin's player this year. Lets not act like Breida was a top round pick. He was an UDFA. He had a very disappointing senior year. So all and all I don't think we should be surprised that Gaskin is winning the job.
IMHO that fact that we were willing to try for Bell for pennies on the dollar doesn't indicate we are desperate for a RB. While I wouldn't be surprised if we drafted one next year I wouldn't expect it to be any sooner than our 3rd round pick. In fact I wouldn't be surprised if we decided it was smarter to fill that need with a FA signing.
Third round sounds like a good place to find a TE, safety, or center. I'd value them over a RB given what we have right now.