If that's the case, then he's robbing Peter to pay Paul (though there's nothing but speculation there). The reality is, at 91-92 mph with less spin, he's likely going to be hit real hard. Throwing more hittable strikes isn't a recipe for success. He already had a weirdly homogenous arsenal between fastball, slider and cutter. With lower velocity and less spin/tilt from the cutter, he's in no-mans-land with the differentiation of pitches.
As a Cub fan I'm rooting for him, but nothing he's doing is a recipe for MLB success currently.