If he can stay clean , he should have a huge impact in the 2015 season .
Gregory may fall out of the Top - 20 because he failed his drug test at the NFL Combine and failed previous tests at Nebraska .
If Gregory can stay clean , Gregory should have a huge impact in the 2015 season .
Gregory may fall out of the Top - 20 because he failed his drug test at the NFL Combine and failed previous tests at Nebraska .