The thinking is that Belichick traded Cassel to the Chiefs at a discount as a favor to his old pal Pioli. At least three people have outright accused Belichick of it, or at least hinted at it: Jay Mariotti compares the trade to Spygate and thinks Roger Goodell needs to take action, Albert Breer talks about the head-scratching going on around the league, and Tim Graham calls the trade "inexplicable."
http://sports.yahoo.com/nfl/blog/sh...tions-Bill-Belichick-did-somet?urn=nfl,144951