Hansen 30 carries
Peoples 15 carries
Wallace 12 carries
Martin 10 carries
Possible conclusions: Martin is a bit banged up (but he played special teams I believe).
This staff is likely not impressed with the Pinstripe Bowl (really both teams had many opt outs) and he isn't lighting it up in practice to date. Even going into the Bowl, Martin was not planned to be the go-to back, I believe there were injuries (so that staff didn't have him tagged as top dog).
Football seasons are fluid and things can turn on a dime. But, it's reasonable to assume from the empirical evidence that coaches who evaluate him every single day are not rating him as highly as some here.
Also, I wouldn't take anything away from a game with Buffalo. We'll see what the plan is vs. Wisky.