JC ran a 4.38 at the combine today, which was 4th among RBs. http://www.nfl.com/combine/top-perfo...
I think he was expected to do better, but was almost .1s better than Felix Jones, who he may be battling with for the 4th RB taken. I think Jones' time helps Jamaal more than JC's time helped him.
I couldn't find Limas' time because he was not in the top 10 for receivers. Hopefully they both improve their times at pro day.