If they were a part of the legendary sannin why were not they there. Also why didn't Minato summon lord Gamabunta to help with the nine tails.
Tsunade left Konoha after Dan died, Jiraiya left after Orochimaru got founded out and left Konoha (became a missing nin). Jiraiya already said that he left to keep an eye on Orochimaru and that's when he found out about Akatsuki which he kept an eye on even after Orochimaru left it.
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Also Minato did use Gamabuta to pin Kurama
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