My take is that Stroud is on the downside of his career. Given that DLs need a couple of years to mature, the Bills need to take one in this draft. I think that DE is an even higher priority. Kelsay is just another guy and Schobel may retire or, best case, return for a couple more years with declining production. Even if Maybin develops (year right), the Bills need another DE. No way that Stroud has the quickness to play DE either.
Maybe I'm not looking at the same LB as everybody else, but when I see Poz I see plenty of speed for an LB just not enough physicality at the point of attack. In the defense Buffalo played this year, he was unable to get away from blockers often enough. That's why so many tackles were made downfield. He might do better in a scheme where the DTs are trying to keep the blockers off of him, otherwise I seem him as more of a weakside linebacker like Mitchell.