er jiraiya can enter sage mode himself, as he underwent the same training as naruto went
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its only that a time-bound sage mode is not practical most of the time so they learn to fuse their bodies later on
after the training
Naruto rapidly progressed through the training stages, earning praise from Fukasaku for so quickly catching up to Jiraiya. Once Naruto attained Sage Mode, he taught him Frog Kata. After Naruto mastered the fighting style, Fukasaku began the final step of trying to fuse with Naruto as he had done with Jiraiya, something that proved impossible because of the Nine-Tailed Demon Fox sealed within Naruto.
fusing the bodies is only the final step
not that it is needed, as techniques like ranji shigami or yomi numa would end tsunade