Brady put up over 4800 yards and 50 TDs in 2007 when they really started to use him more as a pass first option and at times barely even ran the ball.
Also, the difference between what Allen is doing and what Brady did, mainly because of his dual threat ability as the best RZ QB of all time, is that if they play the same number of games and Allen continues at this pace, he will end up with a staggering 160 more TDs than Brady with 809. Also should easily extend his record streak of consecutive 40+ TD seasons to 6 with no end in sight...no other player has done it even 4 times and Allen is cruising towards a record that may never be even approached let alone broken...10 years? 12 years?
Allen has a decent shot at becoming the all time leader in rushing TDs at this point, which is absolutely absurd.