My thought was that CJ did below average against his own division and blew up the rest of the league, but I don't know that the data bears that out:
2004 Clev--1 TD, 154 yards
2005 Clev--0 TD's, 113 yards
2006 Clev--1TD, 78 yards (1 game)
2004 Pitt--1TD, 80 yards
2005 Pitt--0TD, 148 yards
2006 Pitt--0 TD's, 11 yards (1 game)
2004 Balt--2TD's, 260 yards
2005 Balt--1TD, 179 yards
2003 CJ was 1355 and 10 with 440 and 4 against his own division and 900 and 6 outside it.
2004 CJ 1274 yards, 9 TD's, so this was the best year he had against the division, 500 yards and 4 TD's in 6 games and 774 and 5 in 10 games outside of his division.
2005 CJ 1432 yards and 9 TD's, 440 yards and 1 TD against the division, 1000 and 8 outside it.
Pretty small sample set and I don't know that anything is proven here, but his yards are pretty stable around 450 against the division, but the TD's are a little erratic, as are most WR's TD's. Pretty good bet that CJ will still end up with 1300+ and 9 though at the end of the year though.