Kishi , i smell a fish :D
Karin can heal , so Oro took her , maybe , to heal Tsunade and maybe the rest of the Kages ( If tsunade didnt do it ) ...
But why did Suigetsu go ?
I can think of two reasons :
1. He is one chicken of a ninja , he tried to run from the fight and Karin nailed him LOL
2. He can turn to water and we all know who died in water and is deep down DEAD LOL ...
Can you guys think of a reason why would Suigetsu go with Oro , other then those i wrote ?
I think now it is more possible that Kishi will Edo Tensei Jiraiya ... The only problem for that is , Jiraiya is in the Rain Village and it would take time for Oro to go and take the DNA ... plus Oro might have gotten the DNA when he fought with him and Tsunade , 5th hokage arc , if so then any reasons why would Jiraiya get edo tenseid ?
So your positive opinions are welcome