ur list should read something like
itachi (oro said itachi it stronger than him, itachi should just be able to beat jiraiya, at the time when he said hed die he had already mangekyoued in that day, which is a huge drain on chakra)
jiraiya/oro (im not sure about whos stronger out of these 2 and we havent really seen jiraiya fight)
tsunade
kisame (hes more around kakashis level, not tsunades)