This goes back to the fact that some posters here don't think that having an elite closer is important, which also may go back to the old argument of "clutch".
If you don't think players are clutch then you don't think you need an elite closer to get them out late in the game. You can just throw any old guy out there (Kelly, Barnes, Ross) in the 9th to get the hitters out. We'll know these pitchers will be successful because the stats tell us that over the run of a season the hitters they'll be facing get a hit fewer then one time in three. Statistically one of the three hitters due up will reach base and three of the first four will make outs. Problem solved - statistically.
Frankly, it's beyond me why anyone could look at what the Sox did with Papelbon, Folk and Koji, the Yankees did with Rivera, what Kimbrel did last year and even what the Guardians did with Andrew Miller - who wasn't really a closer but more of a Fireman, a guy with closer ability to put out the fire and get the game to their real closer Cody Allen - and think that their team has as good a chance of winning the WS without an elite closer as they do with one.
We're paying David Price $30M a year because we recognize the value of an elite starter, JD Martinez almost $24M a year because we recognize the value of power in our lineup, and yet we fail to recognize the value of having an elite closer.
Having an elite closer isn't the only way to win but if you don't have one of those you'd better have what you do need and I don't see the Sox having the pitching, the hitting, or the defense to dominate without that closer. Some things are worth having and to get them you have to pay for them.