The problem with using this metric to gauge success is that there are so many variables - it's not just "who on the team has first-round talent?" It's which NFL teams are looking, how stacked each particular class is at those positions, who leaves early, etc. etc.
If we're talking "who has first-round talent" I think we might have three guys RIGHT NOW that are playing like first-rounders - Chad Thomas, RJ McIntosh, and Kendrick Norton. DJack is close already and Joe Jackson is coming on fast if he stays healthy. Willis could play himself into the early rounds if he gets enough reps.
I think we might see as many as 6 guys from our current DL in the NFL in the next 2-3 years.