So we evaluate the best we can using our own information while acknowledging the other factors in play. I don't see use in looking back and saying "Wow we only got half of RA Dickey and Devon Travis for Roy Halladay"
He hasn't put up -4.5 WAR, he's put up -4.5 runs above (well, below) average. -5.7, actually, going by fangraphs. That equates to costing the team about a half a win. In 3/4 of his years in Toronto, his RngR (Range Runs) were above average, and now they're significantly below average; unless it's something about Oakland's stadium, he might not be the same defender anymore. Or it's just noise in the defensive metrics; they're really not reliable until you've got a good sample.
I took all of them from google except for Bautista and Valencia who Hurl brings up all the time idk
Oh speaking of Hurl, Kevin "Scrap and grit" Pillar!!
Sandy Koufax was ok??
Hank Greenberg, Kevin Youkilis, Ian Kinsler, Danny Valencia da best, Brad Ausmus, Lou Boudreau I know his name, Gabe Kapler, Rod Carew, and believe it or not, Jose Bautista is a little bit Jew I think!!
No one is arguing that LD% positively correlates with BABIP, or anything else stated in this post.
LD% becomes reliable at 600 BIP. Sanchez has a third of that. Sanchez's LD% is entirely unreliable, which means that we cannot say he suppresses LD, which means we cannot say he suppresses BABIP.
http://www.fangraphs.com/library/principles/sample-size/