His full quote was: “Those guys are all here and know what the system is and the best players are going to play. Obviously we have two really, really good ones at that position and I really like Ke’Shawn Vaughn. I think that with an offseason he’s going to have a breakout year also. All of those roles will be defined by the time that we get to the last week of the preseason.”
While his enthusiasm is noteworthy, Arians's cart is likely well ahead of his horse as the team recently signed Leonard Fournette to a one-year deal and Ronald Jones remains fully in the mix as well. As pointed out in the linked article, the two backs accounted for 79% of the team's snaps during the regular season while Vaughn was fourth behind LeSean McCoy. McCoy is now out of the picture so Vaughn does move up the depth chart but doesn't figure highly in 2021 without injury above him. Vaughn, DLF's RB39, will remain a developmental talent in 2021 with a chance for a more significant role in coming years.