Two thoughts. First, I don't think the original post intended this kind of signing to be the only move or, indeed, even the major move. These would be low-risk, low cost moves. Second, a shorter-term deal may make sense. Starting pitching in 2020 may not be a problem if the 2018 AAA starting rotation contributes by then. But, there is a hole or two between now and then. I may not agree with the list, but I understand the thinking.