Part of me thinks the roster spots are already locked up: Grant, Jackson, Wynn and Sutton with Lumpkin on the PS if he clears waivers.
However it is likely that Wynn, Sutton and Lumpkin will be getting the vast majority, if not all, the carries against the Titans (who play their 1st team in game 4).
That is a huge opportunity for these guys to impress the coaches.