Clemson's Mackensie Alexander is one of the most physically talented cornerbacks in the 2016 NFL draft class, but his stock may be on the decline as April 28 approaches.Continue for updates.Report: Teams Concerned with Alexander's PersonalityWednesday, April 20According to Tony Pauline of DraftInsider.net (h/t WalterFootball.com), multiple NFL teams are worried about the manner in which Alexander carries himself off the field:Despite his on-the-field talent, numerous sources have told me the junior cornerback is a very difficult person to deal with off the field. He was difficult at Clemson, and some of his coaches are giving Alexander less than rave reviews to NFL teamsand I'm being kind. This is something originally brought to my attention during Clemson's pro day on March 10, and something I took with a grain of salt. But since last Friday, I've spoken with multiple sources, and it seems Alexander's off-the-field personality has been spoken about at length in war rooms around the league. In my opinion, the junior cornerback has the best ball skills of any defensive back in the draft, but if he starts to drop deep into Round 1, or even out of the first frame altogether, it'll be due to his off-the-field persona.The 5'10", 190-pound Alexander started as both a freshman and a sophomore for the Tigers over the past two seasons, although his production was fairly light.He didn't record a single interception during his collegiate career and didn't make many splashy plays in general.Even so, this stat, courtesy of Pro Football Focus, suggests he was a lockdown corner at Clemson in 2015:While Florida State's Jalen Ramsey is the consensus top cornerback in the draft, Alexander has often been mentioned in the conversation as the No. 2 guy along with Vernon Hargreaves III of Florida and Houston's William Jackson III.If he is considered to be at or near the same level as the aforementioned players from a talent perspective, then potential character concerns could possibly drop him below them.Quality cornerbacks are at a premium in the pass-happy NFL, so a team will undoubtedly take a chance on Alexander at some point, but the notion he could fall out of the first round would represent a significant fall from grace.Alexander was once seemingly considered an opening-round lock, and while that may no longer be the case, he still has the skill set needed to be a great NFL corner regardless of when he is taken.Follow @MikeChiari on Twitter. Click here to read full news..