That would be a huge mistake. The NL central race is going to be much too tight a race to wait half a season before fully upgrading the rotation. He could be a believer in first half Hammel. Or he could believe it was the hamstring (right?) injury that diminished Hammel's effectiveness in the second half. Personally, I'm okay with adding one MLB starter, someone with options like Sierra and then additional depth at the upper levels of the minors. I don't see a huge need to add two pieces to the rotation right away. 2016 and 2017 are likely the best squads this team is going to have over the duration of their playoff window. Lester is only going to get older, Arrieta will only get older and possibly be gone, etc. Everything needs to be poured into this year and next. Going into 2016 without significantly improving the squad is a huge mistake.