Respecifully disagree. Chris Johnson has mastered an approach (square balls up, flat through the zone, use the big part of the park) that results in him hitting less balls that are caught. I know he's hitting more line drives than anybody in baseball except maybe Cabrera and I don't even need to look at Fangraphs to know that.
You wouldn't have any problem saying, well, Wade Boggs and Tony Gwynn and Rod Carew have high Babips because they have unique skills (hit 'em where they ain't). I think Johnson has a unique skillset. He can't call his shot like Carew could, but I saw enough ground balls with eyes from these three guys to know they could do something other guys can't.
So can Chris. He has mastered the art of the line drive. He still doesn't recognize pitches as well as some of those guys of yore, but when he recognizes (or guesses) right his swing is so flat through the zone. He hits most everything hard. And since his approach is to hit to what he calls "the big part of the ballpark", more of his batted balls fall for base hits. He's stopped hitting for intentional power; actually, he still has some nice pop, but that's not his goal. Line drives are.
It isn't luck. That theory and assertion drives me nuts. He won't hit .420 for his career on balls in play, but he'll be well, well above the norm. He is, quite simply, an excellent hitter who has refined his technique and is playing at the top of his game. And either your stat doesn't capture that or you're misinterpreting it.
I am aware my position is the debil on this board, where so many people appreciate advanced metrics. But consider what I am saying. There's something to it, even if I haven't laid it out quite correctly.