The problem with Willis is that he is playing in a 3-4 that isn't very conducive to fantasy points. I still like him more than the other two.
If Willis was playing in the middle or WLB, this would be a landslide vote IMO.
Ahhh ... (with all due respect) I think that's overhyped, mythical if you will. I'm pretty sure somewhere in this forum this was discussed and If I remember correctly, there were some good points and cases made for the 3-4 ILB.
I'm still in agreement with it myself.
There are a few exceptions (D. Edwards) but from my leagues I still see depressed scores by the 3-4 ILBs.That said since the question is who is your choice in a dynasty format, it's still Willis. He's the most talented of the bunch. As a PSU

I really like Pos as well and think he could be one of the next great MLBs. Beason could also be a force if he ends up inside. All in all, the 3 are all very talented and you can't go wrong with any

.
While Willis may be the best player, Pos or Beason could be the best fantasy scoring player.