as long as we are comparing stats look at the last 10 games of 2008
thigpen 2216 yds pass 16tds 8 int, 325 yds rush 2tds 84.14 rating

cassel 2598 yds pass 15tds 7int, 211 yds rush 2 tds 91.01 rating

not a huge difference considering the pats advantage in quality players , receivers and coaching....i don't know if that is worth a 2nd round pick for the differnce.