Extrapolating to a 5th game, Marshall would be:
#1 in the NCAA for rushing TDs: 11
#7 in the NCAA for rushing yards: 653 (~130 yds/game)
Instead he's currently #2 and #14, respectively.
If we were playing a 12-game season, Marshall would be on pace for #5 in NCAA history for rushing TDs behind Barry Sanders, Montee Ball, Keenan Reynolds, and Kapri Bibbs. (9/4 * (12 + 1)) = 29.25