This is a plausible theory (one I hope proves to be not true). He has been a strong hitter with terrible plate discipline. He has had Vlad like ability to square bad pitches. If that is gone... either he learns plate discipline or he's gone from baseball. I hope it isn't gone.
Range may be weight related, but reaction + hand/eye at the plate? Not buying it.
This was my biggest fear when he signed and
this Fangraphs piece breaks it down specifically.
Last year Panda's out of zone contact rate dropped from 79.8% to 77.9%. Of course, his career average is 78.1% so it could just be normal variation. Either way, this graph is a bit frightening. That said, Fangraphs
has a piece up recently about the possibility of a Sandoval bounce back and they make a pretty solid case for it.
That’s not to say there isn’t a good explanation, because there is a good explanation. In fact, I suspect you’ve heard it before assuming this isn’t your first FanGraphs article. It’s random variation. That’s not a very satisfying argument to make, though. Looking at his defense on a micro level and comparing it to his defense in 2014 might yield more specific issues from a scouting perspective, but on the whole, players have good seasons and they have bad ones.
Sure! But how? It’s another concept in which you may be well versed if you are a regular around here. It’s called regression to the mean. In a basic way, regression to the mean is the idea that any extreme number will move closer to the arithmetic mean upon a second test. In essence, it’s likely that more of the plays Sandoval will be asked to make next season will, for a variety of reasons, be made.
They took a look at the worst defenders from 2014 to see if they improved in 2015 and by a large margin, they did. So they conclude with this:
Sandoval has his age and his defensive history as an above-average player going for him, but mostly we can expect some improvement from him because it’s simply mathematically hard to be that bad again. So fortunately for the Red Sox, even if Sandoval isn’t as good as they wanted him to be, it’s likely he’s not as bad as he’s been. At least defensively. Let’s just agree to not talk about his hitting.
They're (or at least Matthew Kory) aren't optimistic about him at the plate in 2016, but I think there's actually some reason for optimism there as well. For one, if he just regresses to his career BABIP his 2015 numbers look very similar to his 2014, and that's a pretty good player. Even if he declines from that to be merely an average player, that's enough for the Sox to not have to worry about him in 2016, and to compete for a division title.
It's certainly possible he'll be terrible again, but there are reasons to believe he will be an acceptably productive player this season.