Shukaku's as well. Since he was the one who gave Shukaku and Gyuki's chakra to Naruto, he must've been Shukaku and Gyuki's jinchuriki, albeit for a very short period.
Why isn't Obito a Junchuriki of Kurama? When he sealed Kurama into Naruto, Obito was transferring Kurama from his body, not from Black Zetsu's.
Sarutobii2 wrote: Why isn't Obito a Junchuriki of Kurama? When he sealed Kurama into Naruto, Obito was transferring Kurama from his body, not from Black Zetsu's.
That's a pretty good point. Feel free to bring it to the talkpage.