What should really be pointed out is that McCluster is not only short, just under 5' 8", but more importantly, he's not even 165 lbs.
He is, by NFL standards, tiny. Teeny tiny.
What Warrick Dunn did at 5' 9" and 190 lbs was considered to be pretty amazing considering his size. He would run over McCluster like Jacobs did Laron Landry.
Visual aid (check it out at 22 seconds and 29 seconds):