Not that it was a dramatic improvement, but his walk rate DID improve a little in the 2nd half.
In the first half, he walked only 8 times in 369 ABs, or 1 every 46 ABs.
In the 2nd half, he walked 15 times in 282 ABs, or 1 every 19 ABs.
He was batting only .185 on April 29th, and he struggled in September after the heaviest workload of his young career.
However, he batted .280 in May, .248 in June, .297 in July, and .266 in August.
If he can even be a .280 hitter with a .320 OBP, he's a lock to be a top 30 OFer and his value is even higher in points leagues.