Board Thread:Wiki Discussions/@comment-3238846-20140422105553/@comment-3361615-20140423221634

Whatever Roshi's situation, I think it don't change the fact that Naruto asked the Lava Release to Son Goku, and Shukaku offered the Magnet Release. Until more information is given by the manga, this is what we have: he can't use these natures on their own and need the chakra of Tailed Beasts.