Yeah, I take 2nd half Hammel seriously. I also think guarding against injury is a good idea. well, hammel is probably coming back next season since he's on a $10m club option next year, which looks to be a bargain. if he comes back then they've already got 5 starters signed for 2017, plus guys like warren, cahill and wood can easily be stretched out to throw a few innings as spot starters and long relievers. i don't see how starter is remotely as urgent a need as a strong 7th/8th inning (preferably LH) reliever. I think Warren joining the rotation and the talk about a 6 man rotation after the break is a way to give them the chance to take a preventative measure against injury(specifically Arrieta/Lester) or a downturn in productivity(like second half Hammel). Relievers are probably the more immediate need, but the Cubs probably don't have to choose, and dealing for a starter is likely going to be more difficult to finagle than shoring up the pen.