Exactly. At Marineford Luffy had the support of the Whitebeard Pirates, Jinbei, Ivankov, Buggy to some extent Crocodile and more. He has the Happou Navy and Dwarves behind him now, maybe Bartolomeo and a few other contestants, but that doesn't come close to the Whitebeard Pirates. It doesn't seem possible for Luffy and co. to triumph without serious aid. All that tying into how unlikely it would seem for Luffy and Zoro to triumph as of now. But putting up a fight I can see.