I get the hot hand thing, to me, just my thought, treat them as 1A and 1B. That said, also treat them DIFFERENTLY as 1A and 1B. IMO, start Chuba, run him heavy first half, spell him on third downs with rico, then give Rico the 2nd half. ALL 2nd half. Rico was gassed toward the end, we had etienne spell him, that shouldnt happen. Let chuba grind in 1/2 and rico finish.
Either this or legit just go game by game, rico gets the jets, chuba gets the bills. If you think they are volume runners, let them get their volume for a full game then rest the next week with them as an option off the bench. It hasnt really been done but I dont know why it wouldnt work and also save lifespans for RBs.