If you plan on competing in 2015, I think it's worth a lot. A competitive 2015 Cubs team relies heavily on guys who haven't played in the majors. We don't need to add more guys with that risk. I also don't trust Maeda(So he'll probably outperform Tanaka), nor do I think we save much cash going for him over Lester. (Unless the 20M posting fee is somehow counted outside of PTR)