here is a look at the team's history at the quarterback position under Belichick:
2013: 2 (Brady/Mallett)
2012: 2 (Brady/Mallett)
2011: 3 (Brady/Brian Hoyer/Mallett)
2010: 2 (Brady/Hoyer)
2009: 2 (Brady/Hoyer)
2008: 3 (Brady/Cassel/Kevin O'Connell)
2007: 3 (Brady/Cassel/Matt Gutierrez)
2006: 2/3 (Brady/Matt Cassel -- Testaverde/mid-year)
2005: 3 (Brady/Cassel/Doug Flutie)
2004: 3 (Brady/Rohan Davey/Jim Miller)
2003: 3 (Brady/Davey/Damon Huard)
2002: 3 (Brady/Davey/Huard)
2001: 3 (Drew Bledsoe/Brady/Huard)
2000: 4 (Bledsoe/John Friesz/Michael Bishop/Brady)
http://espn.go.com/blog/boston/new-...qbs?utm_source=twitterfeed&utm_medium=twitter
Only 4/14 years has BB carried only 2 QBs. 3 this year seems more normal.