Those numbers you are quoting were tallied up to 2006. Now, I don't know what he did over in Japan but 5 years later, he is pitching fantastic in 53 innings which isn't that small of a sample size. That's almost a third of a season for most pitchers. Guys bloom late all the time and this may just be another case of that.
Personally, in a non keeper, give me the older more experienced guy who is tearing it up this year over the younger, inconsistent player.
20tm dynasty 5x5 w/BB,HLD
5 SP,3 RP