Not sure how Kimbrel came to the table, but no, sorry he is not comparable just yet. While I do like Koji and Kimbrel, they still have to show 10 Y of duty as CLOSERS at MLB level with durability and consistency in order to make a case. Unfortunately I do not see Koji pitching more than 2 years at high MLB level. I even have my ?s for next year. Also while he was a star in Japan, as you said that league is not even comparable, so you just can not make a case either. As for Kimbrel, sure! he probably will be the best closer for the next 10 Y but lets give him time to consolidate first since a lot of things can happen and the injury phantom is always around mostly behind pitchers.