nfldraftscout.com has him rated as the 4th. CB, low 1st to 2nd round.
He's the 7th. ranked CB at nfl.com.
http://www.nfl.com/draft/2015/profiles/quinten-rollins?id=2552263
If you read the above scouting report and strike out the "good tackling" comments, tell me that doesn't sound like Shields?
Unfortunately, with a 4.57 at the Combine, he's not in Shields recovery speed ballpark. We'll see what he does at his Pro Day. Shields and Rollins are both 5'11", but Shield's Combine vertical was 2 1/2" better than Rollins.
In short, Rollins is slow for a cover corner, he's short, and his jumping ability is not what you'd want to compensate for the height.
4th. round, maybe, if he can improve a bit on the 40 time. If the Combine was just a bad day and he puts up a 4.40 at his Pro Day, I might rethink it.