My headcanon will end up being right tbh. Fujitora is the strongest of the three Admirals and will fight Zoro.
In my headcanon, the fight against the Admirals and the Marines will begin with Akainu launching Ryuusei Kazan and Fujitora sending a dozen meteors toward the SHs and co.
Luffy and Zoro then step up and "Hakai" (the strongest version of their combo attack on the train). All the magma punches and meteors are wiped out.
"Show off while you can, Straw Hat. I will bury you and your crew like I buried your brother."
"Big words for a dead man walking."