Standard depth chart, based on starters and experienced players with the less experienced players at the bottom of the depth chart, not really an indication of projected roster.
The first 3 units listed looks like the projected roster, minus some backup OL, FB, DL, LBs, and DBs cut to bring it down to 53. We’ll have a 4th RB but don’t know who it is yet.
Jordan Howden’s the only listed 4th string who’s most likely make the team IMO, for ST and DB depth.
AT Perry should stand out more than one of Kirkwood or Washington in preseason games. But they have as much chance to make the 53 as Perry.