I don't think he'll walk much because his hand-eye coordination is so good, he will make a lot of contact early in the count. If he swings, he's going to make contact at a huge rate.
Madson should have never been closing, but how in the hell do the Cubs develop guys like Bote? Miller has dominated righties this year, while Madson is worse against them. Martinez is a HORRIBLE manager.
He's also so bad at hitting sliders/curves right now because he's flying open. He got to that fastball yesterday because it was in the only spot he can really hammer right now.
You also see the Indians just demolish him today because they've seen his sinker movement so much this year, they're not surprised by it the first time through the order.
It's also because his secondary off speed pitches in terms of slider and curve are really bad. His splitter has graded out ok, but for the most part, hitters know they can sit on the sinker and it's been up too much in the zone.