The Dallas Mavericks have a bunch of players on the team this year that are going to be contributors, either in the starting lineup or coming off the bench. Some days, those players are going to switch, as Rick Carlisle has made it pretty clear that the Mavs plan as of now is to change up the starting lineup based on matchups.
This likely means we will get a chance to see a bunch of different guys start a few games, but not the majority. Players like Seth Curry, Maxi Kleber or Dorian Finney-Smith will probably not be everyday starters, but may see the court in the times when their skillsets better match the situation.