Colvin is at least a pretty good nickel corner and he might be something more valuable but it's hard to get a read on his ability. 
Somewhat frequent injuries and a fairly lackluster few games filling in at outside CB don't really have me convinced.  

I like his tenacity playing the slot and he's got a knack for that DB blitz that deserves mention. 
 Beast?  Eh, it'll take more than a tweet from PFF to convince me.  I like him though, and I really hope he and Ramsey are 100% when September rolls around.

---