Theo thinks some of the problem with walks, especially in the playoffs, was due to the organizational approach, e.g. being too fine in hitters counts: http://chicago.cbslocal.com/2017/10/19/theo-epstein-takes-blame-for-cubs-pitchers-wildness-notably-in-bullpen/ So if that's correct, then hopefully you see some slight improvements from the likes of Edwards and Montgomery(if he's in the pen) from doing a little less nibbling. That said, I think you'll see a bit of a priority in strike throwing this year as a result. Guys like like Shaw and Nicasio. From the left side, I imagine they'll find another Duensing, but it's tough to tell about targets since LHRP are heavy on guys with control problems, and Duensing is an example of a guy who did not look at all desirable after his 2016.