Yep he was tops, and Trusnik was #3 in the league for the pre-season as well.
Yes, Trusnik was #3 and what PFF doesn't factor in is that many of these LBs were going against 2's and 3's in offenses that didn't really game plan. I liked McCain's rushing ability, but he was not good in coverage and took some bad angles allowing a few big plays to his side. I'm glad they kept him on the roster as he is worth developing, but he still has a long way to go before being a starter imo.