Imagine having a deep hatred over a group of fictional characters.
There is still plenty of time for one or two of them to still get confirmed to have CoC, characters like Sengoku and Garp weren't confirmed to have it until way later on.
Just because they haven't shown it yet, doesn't mean they don't have it.
Cope more with the last one you moron, the OG trio Admirals definitely have future sight.
Most thought Kaido didn't have future sight until way later on during his fight with Luffy where it was then confirmed that he actually has it.
Let me be explain something that even you should hopefully understand, the problem is that so far we have yet to see any full fights with the Admirals.
Luffy vs Kizaru wasn't even a full fight and Oda had to temporarily stop that fight, so he could mainly focus on the Kuma flashback.