Geez. Talk about playing with the magic 8-ball.
OK, without looking at any sources (well, in the last 5 days, anyways) and after some heavy mojitos (I think I've covered myself now if I end up way off), I'd say.....
3.40 ERA, 17+ wins, 170+ K's, 1.20- WHIP.
I do know though, that: family is important to him; he occasionally dyes his hair; his nickname is, "The Monster" in Japan; he's married to a former TV anchor who speaks good English; he once through 250 pitches in a game; he was the MVP of the WBC; he won the equivalent of Japan's March Madnes in high school; he wears a sleep mask when sleeping on a plane; Bobby Valentine thinks that every starter in the Japan league could be on a major league roster; he has a good sense of humor that doesn't get translated by Scott Boras' designated translator; and he likes seafood. So whatever stats you project him at you can filter through those ever so important facts about him that have been divulged over the course of his signing with the Red Sox.