According to Scout.com, Barkevious Mingo is the 2nd rated DE, and 6th overall in the Draft, while Lemonier is the 7th DE and 24th overall.
2012 Mingo: 6-5, 240, 33 Tkls, 4 Sacks, 4.61 40 Yd Dash.
2012 Lemonier: 6-4, 242, 28 Tkls, 5.5 Sacks, 4.78 40 Yd Dash
Mingo had a huge dropoff in production this year from last, just like Lemonier. Why? Guessing, that at least a little was due to teams paying more attention to them, and scheming to slow them down. Lemonier was the only thing like a defensive threat we had this year. He had 5 sacks in the first 4 games, and his disappearance coincided with the falling apart of the entire team after the LSU game. Mingo had Montgomery on the other end of the line. The difference in Mingo and Lemonier? An inch in Ht. and a significantly better 40 time. Those numbers are on ESPN.com, and the combine will tell the truth on those things. Also, like Prowler said, his cover skills, how well he can turn his hips, run and change direction will be a big deal. A guy like Lemonier could really shoot up, or drop off in the draft based on his combine, because he projects more as a 3-4 OLB, and has not had a chance to show some 3-4 OLB skills needed at the college level while playing in a 4-3 scheme. He may or may not have them. Or he could go as a 3rd down specialist to a 4 man line team. I think he's a tad light to play every down in a 4-3 system.
I hope he does well.