Kimbrel’s second half numbers actually weren’t much different than the second half numbers of 0.0 bWAR closers like Cody Allen and Bud Norris. The Sox might have had a worse record with either of these two (both of whom also appear more likely than Kimbrel to be the Sox closer in 2019), but certainly not worse enough to finish behind New York. While the”what if” game is impossible to prove, we’re talking about an eight game difference here. That’s a lot, especially in an era where closers rarely if ever handle tough saves.
But then if the Sox didn’t have Kimbrel, the closer probably would not have been a 0.0 bWAR reliever. The worst case scenario is probably Barnes as closer, and right now by virtue of being here, he’s the front runner for that role, at least until some other deal happens.
So if Barnes was closing instead of Kimbrel, how much worse would the Sox have really been? I think that question rests more on who had to replace Barnes in the bullpen. Which might be the plan for 2019...