Minato I already put my point about him several times, if you don't know how to read properly it's not my fault. ^^
For Jiraiya, it was already known that he may have a very big chakra reserves with the fight against Oro. Despite being on drug effect, he used a mud technique in quite a big scale,
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but still was disapointed
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.
So he
implies that he wanted a way bigger swamp in order to sink a giant summoning. By the scale it already requires a huge amount of chakra and he made it at the begining of the fight. From someone with his experience, he wouldn't have put a technique from the start who could have drained most of his chakra from the start just in order to neutralize a summon. So by logic thinking, he tried to make it because he knew he had enough ressources to do that and continue the fight.
At the end of the fight, even though he was hurt ( a rib and a leg broken ) he still standed, tired but still in condition to continue the fight to some extant while tsunade had more difficulty because of the byakugo backlash even though she had less injuries at the end.
The statement was confirmed by fukasaku of Jiraiya having massive chakra pool. On the other side everytime Sasuke used something big, he shown immediate signs of fatigue because it drained a lot of it. It implies that he can't use big techniques very often otherwise he would deplete his reserve in no time.