Cause he killed it in training camp against other rookie and street free agents. It's where legends are made.
Another thing about Batten that scares me is that I've read the Bills are training him to play the ILB spot. Thats what they did with Moats and many can remember how he looked in coverage during the preseason. So that would be DE in college, OLB during camp, and now ILB.
Seriously though, if Poz is resigned, then you can have him, Moats, and Merriman as 3 out of 4 LBs hypothetically. A free agent (David Harris, a long shot, I know) would alleviate a major need and allow it to be used on the lines. Makes almost too much sense, I know.