Among several other needs this winter, the Cubs would do well to address the lack of swing and miss in their rotation. Cubs starters ranked 24th with a 20.3% strikeout rate, while both their 7.78 K/9 and 9.7% swinging strike rates ranked 25th in MLB. League averages for those respective categories were 22.1%, 8.47, and 10.8%, so the Cubs were roughly 8-10% worse across the board. Not great.
Also not great is that they could end up just running it back, assuming Marcus Stroman chooses not to opt out of his third year and that the Cubs pick up the $16.