kabuto inherited the DNA samples oro had collected, plus the people who had died after oro did (nagato for example) were only stolen by kabuto. hashi and tobi combined would pretty much defeat anyone (except hiruzen of course but hes a shinobi god) so what chance does sasuke and naruto have.don't think we can just assume Madara is one of Oro's potential summons seeing as Kabuto has pretty much rose above Orochimaru in that jutsu, if anything at least keep the Edo realm in what we know and give him Hashi and Tobirama.
well lets see strength on par with her teacher, medical knowledge surpassing everyone in Suna, shizune's poison kunai, poison gas to put people to sleep instantly etc. if given a shot, i think she could get jiraiya off guard.And yes Sakura would be virtually helpless in this situation. Because you know how strong somebody is doesn't mean you have the necessary tools to do anything about it
battle isnt just head to head face to face you know. sakura can AT LEAST distract jiraiya (he is a perv you know) and her master for a while, leaving oro more open to attack.