Nesbitt or Washington is probably a more interesting comparison to Marshall in terms of carries. JT didn't seem to keep it up the middle as much.
JRjr
#1 QBs carries/g under CPJ
2008) 15.6, 172 in 11 (Nesbitt)
2009) 19.9, 279 in 14 (Nesbitt)
2010) 18.4, 166 in 9 (Nesbitt)
2011) 18.7, 243 in 13 (Washington)
2012) 9.1, 127 in 14 (Washington)
2013) 14.0, 182 in 13 (Lee)
2014) 13.5, 190 in 14 (Thomas)
2015) 12.1, 145 in 12 (Thomas)
2016) 11.4, 137 in 12 (Thomas)
2017) 25.0, 75 in 3 (Marshall)
***I did this quick so could have screwed up the # of games somewhere***
Obviously we've got a smaller sample size that includes a 2OT game. But it's still a lot higher than even Nesbitt's high volume seasons. Presumably the defenses are forcing us to do it so if they continue to do so we're gonna need to start sprinkling in some Jordan/Jones/Johnson series to spell him. 25 carries/game is a lot for a RB and he's not built like a RB.