I think it depends who you are trying to get on the roster. O'Hearn and Urias are certainly the most "replaceable" options. If O'Hearn were moved, it would open up a spot of Stowers or Kjerstad while Mayo could have a spot if Urias is moved. I don't see Nevin on the team either way, but I guess he could take the O'Hearn spot, but I would be quite upset if we traded O'Hearn to give the spot to Nevin.
I view O'Hearn as a useful piece, but a skill set that we can replicate on the roster. Urias is much the same.
Honestly, I see both on the team to start the year with a position player roster of: Adley, McCann, Mounty, O'Hearn, Westburg, Henderson, Holliday, Urias, Mateo, Cowser, Hays, Mullins and Santander.
If someone needs a LHH and was willing to give up a good bullpen piece, I'd be onboard with moving him, but I don't see it. I think the moves we see are probably a trade for cash considerations of our out of options guys