He is most likely getting the start because of the un-injured backs he is our most balanced.
AA - Speed and elusivenes, not good at pass blocking and not an every-down back
RH - Bowling ball of power, but not a true all-purpose back...still would like to see what he can do
JJ - Pass blocker, sort of a miniature version of what Scwapp is supposed to do
Those guys are all sort of specialty guys at the moment, so TT gets the start simply because he is our only uninjured all-purpose back. I fully expect the other guys to get worked into the rotation a lot, moreso than usual since JA is out and TT just hasn't shown as much as him.