I highly doubt he'd get drafted in the second round (or even third). Matter fact, I doubt that Burns would get a top two round grade as well; he was good this year and has the physical tools (a bit overstated imo) but this draft class is shaping up to be pretty deep at CB.
I think some are overstating the draft outlook of these guys. For some perspective, last years draft saw the following DB's go undrafted: Julian Wilson (OU), Kurtis Drummond (MSU), Cody Riggs (ND), Troy Hill (Oregon), Cody Prewitt (Ole Miss), Marcus Roberson (Florida), etc. All comparable or better than Burns and Elder.