He has shown that he can be a 40-60 walk guy...he needs to get back to that.
He has 9 BB to go with 27 K's...a pretty significant improvement from last year. He's never going to walk a ton but is on pace for about 40 BB this season.
Obviously he seems bound to regress some, but he's having an MVP-caliber season so far and deserves to be commended for that.
Fangraphs thinks that if he keeps smashing the ball, then he'll end up with many more walks. He is slightly more selective this year versus last. It's just not translating to walks.
If he gets 20 walks with his .950 OPS and .406 wOBA over the course of the season then I couldn't care less about his walk rate, but I suspect it will spike soon.