To me, I think every bullpen arm could be available tonight as no one out there has had more than one appearance over the past 3 games.
Buchholz pitched or 3 innings on Sunday, so he technically may be available. However, I would probably not bring him in unless this goes to extras.
If the Sox are ahead by more than 3 runs, I would warm Ross in the 7th and go from there. If the game gets too close, bring in Ziegler and Kimbrel.
If the Sox are ahead by less than 3 runs, I go straight to Taz in the 7th, Ziegler in the 8th and Kimbrel in the 9th.
If the Sox are down, I bring Ross in to put out the fire and have Barnes/Abad finish the rest of the game.