Two points: He did meet your qualifications of an "ace" in 2016, but last year was his best year in terms of WHIP. He's also got great playoff numbers and lots of postseason appearances. He's also elite (by any measurement you use) against righties. Lots of innings in Japan, but they do have 6 days between starts, where in mlb you only have four. And one question: Who else would you want as an available starter in 2019 for Graterol? He's a relief prospect with a bad injury history. Chris Archer? Nathan Eovaldi? Jordan Yamamoto? I'd have rather dealt from our hitting prospects, but this makes our team better for 2020 and 2021, and we don't need Graterol in the bullpen this year, even if he was healthy, which is a big if. I agree that we still don't have an ace on the caliber of Justin Verlander or Gerrit Cole, but most teams don't. And JV still has not won a playoff game.