I wish it was easier to find how guys do against velo. The data exists, you see it on broadcasts, but it's not easy to see anywhere. But I think that's the one open question with Seiya. I don't believe he's really turned around a good fastball. He's wrecked some at like 92, and offspeed stuff from more flamethrower types, but I think he's mostly fought off real velo. Even if he doesn't do damage on a bigtime fastballs I don't think that precludes him from being very good, but it might preclude him from continuing to do insane Juan Soto things. The closest proxy(and it's not all that close) is probably the Power/Finesse stuff at BR: https://www.baseball-reference.com/players/split.fcgi?id=suzukse01&year=2022&t=b Definitely doing less damage and K'ing more(expected since the Power distinction is based on K rate), but still hitting very well and taking his walks. Yeah and this doesn't help with velocity at all but he is leading all of baseball in wFB which I believe is weighted runs above average against fastballs, and broken down into wFB/100 fastballs seen he's 4th. It's possible with the small sample size that he's faced a number of lower velocity pitchers but he's definitely crushing fastballs better than almost anyone else in baseball.