I'm digging into Darvish's numbers and it's better than I realized. So by Fangraphs and BR, Yu last year was very good but not quite back to the ace level he established pre-TJ. However, if you look at BP's numbers, which take into account a bunch or extra stuff like framing and quality of competition, he was the 9th best starter in the league, worth 5.2 wins. Also, his velocity post TJ is about an MPH higher than it was pre-TJ, which probably bodes well for how he'll age.