Erm, a jump of K/BB from 1.36 to 7.50 in a single season? How does that even happen?
Small sample size. He only pitched 38 innings at Harrisburg last year.
At Potomac, he struck out 118 with just 25 walks. Just under 5.
His elevation to Harrisburg, he was 30/22.
Even with the control problems at Harrisburg, he was still over 3/1 for the season.
Nonetheless, still a big improvement.
Maybe his time in the AFL as a reliever, gave him the confidence to attack and try to blow it by hitters. Apparently, it's carried over.