Fujitora is probably the worst Admiral matchup for Kizaru. He can take Kizaru's mobility away, which is key.
Teach is another individual who if he is awakened, should counter Kizaru. But now that we know that even FS, Snakeman level work rate, angles, unpredictability, and even G5 levels of speed ontop of FS, has little to no effect on him.
It's going to be very hard to argue anyone outside of mobility restricting opponents can actually defeat Kizaru. Speed, FS, work rate, nothing seems to actually work. I have to say, Oda messed up with this one, but him feeding Luffy could mean Kizaru is never defeated, so Oda doesn't have to deal with the headache of finding this extremely rare opponent for him who can pull off the impossible.