Shinra tensei has only been shown to work with the deva's path. Madara has never been shown to use it as far as I could tell and even with that out the way who is to say he is even proficient enough to use it on a scale such as nagato using it. Also this is all assuming he can react faster than kizaru can move. I highly doubt it. Kizaru's kicks alone have been shown to kick people through buildings causing them to crumble. Also Aokiji has been shown to freeze large areas within seconds with his Ice Age also what will shinra tensei do to stop freezing lol? Aokiji can just keep letting it freeze and after every use of the shinra tensei there is a five second cool down leaving him 100% vulnerable. Also kurama does not pose much of a threat seeing as aokiji has been shown to freeze a sea king and a large majority of the waters behind it in seconds lol. Also do not forget even though they are not intangible aokiji can still move through the ice lol. Also aokiji has been shown to be quite proficient with the use of his devil fruit because whitebeard "stabbed" him with haki and he simply opened his body around the blade creating an opening so he did not get hurt.
With aokiji and akainu on the offensive I just don't see how the duo can pull this one off. They have to constantly avoid being frozen, akainu is hashiramas elements worst nightmare and can rain magma fists which he duo will also have to avoid while trying to first comprehend how kizaru moves so fast. The moment kizaru moves behind one of them they are dead. They simply cannot react that fast and don't have durability on a level that showns them able to take the attack. The pollen can pose a problem to kizaru but it will burn when getting close to akainu and will freeze when getting near aokiji. Pollen becomes inactive in extreme cold or heat lol.
Just because he hasn't shown the ability to use the Deva Path does not necessarily mean he can't but also, he has shown the ability to bend gravity to his will such as summoning that meteorite... And I highly doubt the Three Admirals are going to stop it when they see there's an even larger one coming consecutively behind the first meteorite that dulls in comparison to the bigger one... And are we forgetting Hashirama's wood defense? If Kurama's beast bombs couldn't even destroy Hashirama's wood formations then what makes you think Akainu is going to have a chance? Hashirama literally grasped a Bijuu Dama with a giant wooden palm and, swallowed the release of the impact (Mountain Level), and we cannot forget the many other summons Hashirama has to assist him along with Madara's Perfect Susano'o or Mokuton/Susano'o clones that could overwhelm the Admirals easily with Hashirama's clones... And Kizaru isn't getting pass a Perfect Susano'o so easily, and neither is he going to destroy Hashirama's Wood dome and summons so easy. In fact, Kizaru's only hopes of surviving is evading before the two ladders start dropping nukes on the Admirals.
Also, what's going to save Kizaru from posionous pollen? And I understand that Akoji freezing abilities make him a perfect counter for Hashirama's wood release but, you're forgetting that Madara's in this battle, and Akainu is better dead than fighting someone like Madara who has: Susano'o clones, Meteorites via Rinnegan, Amaterasu, Tsukiyomi, Chakra absorption (If that's equalized), Mokuton no Jutsu, Perfect Susano'o, and even Kurama... And Madara's control over the Kyuubi makes the Admiral's powers pale in comparison. Also, Hashirama's thousand arm goddess literally tanked a spam of Bijuu damas/Susano'o blade (Island level+) without being entirely destroyed, baby shaking the nine tails with a single hand.