First, neither Abad nor Kintzler were more valuable than Sano in 2016 by either bWAR or fWAR. Second, WAR doesn't believe Rosario was significantly more valuable than Sano, as Eddie had roughly half a point higher in fWAR value. That's well within the margins of wiggle room. As for bWAR, Sano had the half-point advantage. Sano was terrible in right field, bad at third base, and spent most of his time at DH. Despite playing all of his time at some of the most bat-first positions on the diamond, he only posted a .781 OPS for the season. It seems pretty damned logical to me that Rosario, even with his .718 OPS, was more valuable than Miguel last season. He's a clear defensive asset on a team that loves to throw the baseball at bats. And given the small difference between bWAR and fWAR (a half point each direction), it's pretty much a wash and certainly not significant. As for Nunez, he played a full season, posted an adjusted OPS just a few percentage points below Sano, and did it while playing decent defense in the field. So you have a guy who hit at a similar clip, played ~40 more games, and was an asset in the field, not a detriment. If you don't think that guy is worth more, I'm not sure what to say. And even then, Nunez wasn't significantly more valuable than Sano. A bit over 1.5 wins by fWAR standards, a bit over 1 win by bWAR.