Checking around all the NFL Mock Draft websites, not a single one of them is similar at all. I did find one that has Burkhead to the Broncos in the 2 round though.
All it takes is one team to really fall in love with a guy. I would be surprised to see Rex go any higher than 4th round though. His injury history is a big concern, as well as his lack of top speed. He's going to be great wherever he goes though.