I always thought Fujitora despite him being weakest admiral he's still = to admirals IMO
Look at Oda masterful foreshadowing
"Perfect we're switching Spots Luffy" But it was too late to fight Issho there bound to fight
Sanji fighting Kizaru is likely to me, But if Zoro takes Kizaru(2nd strongest admiral) Sanji will take Greenbull(strongest admiral) and zoro fans wont like that, so we'll just have to wait