At this point (and I say this as someone who is not a fan of his as a person) if you are talking about trading assets to get a guy, I would explore trading for Hader and making him a starter. The guy started most of his career in the minors before the Brewers put him in the bullpen. He has decreased his BB% the last 3 years and increased his SO per. He is controlled for 4 seasons. Stretch his arm in spring training and see what he can do as a SP. Otherwise, stay the course and get Wheeler +.