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And his gut is glossed up and new.
Most Japanese physical activities, regardless of kendo, judo, aikido, baseball, etc., typically emphasize torso strength and focus. Given his gut being back to normal, somehow I'm not very surprised.
And it's not just WBC either. Ichiro is known to harbor stress. I wouldn't be surprised if he had had a burning gut the last 3 years, let alone the beginning of the season.
(Speaking of WBC, I'm not convinced in the least it has to do anything with Matsuzaka's recent demise. Matsuzaka has been ridden hard and his decline is consistent with the Oakland 3, age and workload-wise.)