Keisel says Flacco isn’t among the best quarterbacks, yet

Tuesday’s edition of Pro Football Talk (NBCSN, 5:00 p.m. ET) featured a visit from the NFL’s answer to Grizzly Adams — Steelers defensive end Brett Keisel. Keisel, one of the funniest players in all of football, addressed a variety of topics with Erik Kuselias and yours truly, including whether a quarterback Keisel knows very well…