Braxton currently has 959 rushing yards this season. He is averaging just under 120 yds/game and is on pace to finish with 1,439 rushing yards for the season, which would give him 2,154 for his career.
Denard is currently 351 yards shy of breaking Pat White's record for QB rushing yards of 4,480. He is currently averaging 128.5 yards/game and is on pace to hit 1803 yards for the season, which would give him 5,032.
If Braxton reached his on-pace target, he would be 2,878 rushing yards shy of Denard's hypothetical career total. It breaks down to 1,439 yards/season or 110.69 yards/game (13 game season) or 102.79 yards/game (14 game season).
So, does Braxton break Denard's estimated rushing record if he stays 2 more years?