Tavon Austin 4.25...

I'm having a really hard time remembering any 5'8-5'9" speedster WRs doing well in recent NFL history. Steve Smith is 5'9 and a 4.4 guy but he also is extremely physical.

When I think of 5'8 speedsters I think of guys like Sinorice Moss.

That alone scares me. I do think Austin can be a beast in the NFL both returning kicks and as a WR but if he was 2" taller he'd be a top 10 pick.

Lance Moore is a 5'9 too. That said, I don't think Austin will ever be a go-to WR but he can be instant offense and Sproles eventual replacement. He's a guy whose combo yards in the right system can be really impressive. Give him 8-10 touches as a receiver, returner, and runner and he will do damage!