Why didn't he revive Jiraiya? Madara told Obito that Nagato was supposed to revive him, so there's obviously not a time limit after which you can't revive people.
>>159437056
They explained it. Kabuto couldn't find a blood sample of Jiraiya and his body was deep underneath the water, so he had no time to get it.
>>159437056
If he did, Jiraiya would just have come to life at the bottom of the ocean and immediately died from the intense pressure