Who's the Patriots' passing-down back?

Brandon Bolden operated as the Patriots' 1st-team passing-down back in Friday night's preseason game.  He finished with 5 carries for 12 yards and 0 catches on 1 target.  Dion Lewis was the change-of-pace back with QB Jimmy Garoppolo and the 2nd-team offense.  He looked good in hauling in all 4 of his targets for 20 yards and a score.  RB James White, meanwhile, didn't get on the field as far as we could tell.  This situation remains as muddy as even with less than 2 weeks until New England's opener.  Avoid all 3 guys in fantasy drafts.