In chapter 1003 the 5SN were in really bad situation, all out Luffy did little to no damage to Kaido and after that he lost his haki for 10 minutes. Now, one of the supernovas <<Zoro>> is busy protecting Luffy while Kid, Law and Killer can't possibly take on Kaido in his hybrid form needless to say about Big Mom. I've said it before and I'll say it again: the 5SN can't defeat even one Emperor and there's no way that they can take down both Kaido and Meme at the same time. In 1003 it was clear that the supernovas are in desperate need of an asspull to survive that fight. And Oda actually foreshadowed it...
In this panel you can see three doors, two of them are already broken, but the third one is still intact. Many people were speculating that there's going to be another character who will join the fight and save the supernovas. The third door will be used by that character who will save the day, someone, who is strong enough that can fight against an Emperor in 1v1. Like I've said it before, someone needs to take care of one the Emperors so that the supernovas can concentrate on the other. If this Oden is the real Oden then you know what's going to happen...