I had high hopes when he was drafted, dude is the fastest player i've ever seen. But he can't stay healthy and is a one trick pony so not suprising.
The Texans signed Dominique Edison, WR, to the practice squad. He went to SFA and was drafted by the Titans in '09. After being released by the Titans, he's had cups of coffee with Seattle and Dallas.
Sproles knows how to juke. Holliday doesn't. That being said I'd say Sproles in a one in a lifetime NFL player, considering his speed, body control, and skillset that compensates his small frame.