It's more objective but not necessarily better. And you are combining several defensive systems that use the same or similar data to come up with their metrics. I don't think that decreases the uncertainty at all. That's like saying that a batter's OPS, WAR and wOBP are all good after a week, so perhaps a week of data is good enough. This is all very simple. It's April 19th. Whatever has happened so far this season tells us very little, whether it be stats or scouting. Yuni has been in the league for awhile now, so there is plenty of data to look at to formulate an informed opinion with regard to his abilities.Right, there is no doubt that ability wise, he is likely going to finish below average. That is not what I, or anyone else making this argument, have been asserting. We are merely stating that based on the objective data compiled by four different statistical models (all who seek to be the best objective measures of defense). Based on that, we can say that Yuni had a few good weeks, nothing more, nothing less. The only reason I even make that point is to show that many have been over-critical in regard to his performance to this point in the season. My goal isn't to try to extrapolate what we can expect of him going forward, or to show his "real ability". If I want to figure those things out, I agree that it is best to look at the career statistics. I see this as the equivalent of saying, "Plush has really started off the season hitting better than I expected." I'm not suggesting that what we've seen from Plush reflects his actual ability, nor that what he's done in the opening weeks of the season can be expected to be continued throughout the season.I'm not talking about descriptive vs. predictive. I'm talking about knowing what happened (batter hit a HR in 1 PA) vs. making an educated guess at what happened (defender making an out on a play that is estimated to be converted into an out 50% of the time by an average defender). We know Plush has had a positive impact because he's hit so much better than an average player. Whether it represents his true abilities or not, the hits actually happened. In contrast, when Betencourt makes an out, we don't REALLY know if that out was as easy or hard as the advanced defensive metrics suggest. They are making a hopefully accurate estimate but with low precision. Over perhaps 70 defensive chances, I will continue to argue that these defensive metrics tell us next to nothing about reality. The rely on a large sample to have any real utility. I am basing my opinion on the writing of MGL, who is the creator of UZR and frequents the Insidethebook.com blog. They had a thread on the fundamental difference of batting stats and UZR type stats. One knows what happened, one is estimating it. Some searching should let you hear it from the horse's mouth.