Jackson - 30 rec, 528 yds, 4 TD - That's 50 catches, 800 yds and 5 TD off his last (and best) year in Philly
McCoy - 895 yds rushing (4.4ypc), 292 yds receiving, That's 400 yards fewer rushing (150 more receiving) and the same amount of TDs, from his last year in Philly. That's also 700 yards fewer rushing, 250 yards fewer receiving and 6 fewer TDs from his best year in Philly (2013)
Maclin - 84 rec, 1034 yds, 7TD - That's the same amount of catches, 300 yards and 3 fewer TDs than his last year (and best year) in Philly.
Jackson - 2nd year of a 4/$24 million contract ($16 million guaranteed) - First year of 3 straight $9.25million cap hits.
McCoy - First year of a 5/$40 million contract ($26.5 million guaranteed)
Maclin - First year of a 5/$55 million contract ($22.5 million guaranteed)
Belichick overstated a bit, but he's right in the fact that none of them are really near their career years, save for Maclin, and he's making $11 million/yr.
That's ignoring those who have totally tanked like Trent Cole and everyone's binky here Evan Mathis.