A healthy Mendnhall makes Russel expendable.
I don't see how a healthy RM makes GR expendable. Espcially if Logan is the "replacement". RM has NOT proven himself one bit, either as a short yardage runner, or a RB in general. He is still a rook for all intents and purposes, and already has durability issues. MM is also not a short yardage back as we painfully saw repeatedly this year. Now maybe its the OL, but at this point I would not want to see the RB corps be FWP, MM, RM, and Logan.
Also, I think you are misunderestimating GR importance on the coverage teams this year too( 9 tackles, Baily had 16). Is RM going to cover punts and KO's?
Don't get me wrong, I wouldn't be sad if he got cut, but would only like to see it for a bigger, tougher back and not a 177# speed guy or a healthy #1 pick that didn't make him expendable last training camp.