Forgive the formatting, I can’t shrink the line spacing, so I eliminated anyone ranked after 32 from the list. I used NFL Mock Database for the ranking, Drafttek for the DL positions, and Fanspeak for the simulations. Fanspeak has 3 different rankings to choose from, I did two for each. The first # after the school listed is the # of times out of 6 the player listed was available at 21. The second # is the rank. These are the players available in those 6 mocks.
I think we can safely say anyone with a top 13 rank, is unlikely to be available at 21, but I left them anyway.