All stats need to be viewed in an overall context. Don't think anybody disagrees with that. But I suspect that good defensive teams make a lot fewer errors than poor defensive teams.
The whole range issue gets interesting in this regards. Who is actually the more valuable defensive player. Freddie who has incredible range and makes a lot of highlight reel plays but also makes a lot of errors on what should be routine plays. Or JJ who doesn't have the range of flashy play ability that Freddie does but he is just stellar on the routine plays?
But I digress. Sorry to derail a thread about Adley into a more generic discussion about defense.
Outs Above Average tries to do that. My very basic understanding of it: if a play should be made 90% of the time and you make it you get 0.10. If you miss it you get -0.90. Add them all up over the season and you can tell who's good. So you will get credit for making the non-routine plays and get rightly hurt for missing the easy plays.
Of course someone (or the model) has to decide what % to give every play. I believe they use lots of variables, things like how far the fielder had to go, how far he had to throw, who is running. So I have no idea how accurate it really is but it has promise.
Saying errors aren't important isn't quite right, but they are not as telling as something like OAA would be, if OAA is accurate.
Sorry to continue to derail.