C185 The Surging Undercurrents
As their granddaughter, Tsunade did not want to take up the responsibility of the Hokage.
If it was possible, Hashirama Senju and Tobirama Senju did not want to force their granddaughter to do things that she did not want to do.
When Tsunade mentioned Jiraiya for the second time, she recommended Jiraiya as the candidate for the Hokage