IIRC the pre-season projected WARs for Sale and Giolito were just about identical. If the projections were right (which of course they never are, but at least they're objective), that means Breslow simply did nothing!
The kicker is that Grissom was also projected to have a 2 WAR or so. That would have sort of made it a win, but not for the rotation.
Just some really strange s*** going on with their thinking IMO.