Was just about to post this here Lol
Agreed though, Sasuke is always analyzing information during a battle and if he's anything in this fight like he has been in literally every other single fight, then he's making a plan around it, and Kirin is the closest we know to Sasuke possibly utilizing Nature Chakra.
He doesn't seem like he knows what Nature Chakra is exactly, so we know we're not going to see a random Sasuke Sage Mode. I think we're guaranteed to see Amaterasu made Kirin again, or at the very least least Kishi just opened the option for his writing.
OT: Just a random thought, but since Susanoo supposed to be a Shinto God of Storms, it would be interesting and fitting if Sasuke's Susanoo could wield the Kirin Nature Chakra like a weapon/sword, so that Kirin isn't a One-Use ability, if we do see it against Obito.