The Texans under Capers seem to like to have diverse gameday packages they use against different teams. Sometimes we see multiple TE sets against one team and more 3wr sets against another. I think that we will use Dom and Tony in the same manner.
One team will have a certain style of defense that will lend itself to certain matchup problems with each back. Hollings gives us blazing speed and a mismatch in the open field. Davis gives us a slasher who breaks arm tackles with ease. I think that they will be rotated two ways; down and distance, and then one back will be in more packages depending on the nature of the defense we are facing.