Despite a good amount of horseshit logic in the OP.
The point of Advanced conqueror's being there for all of the admirals, could be possibly true.
However, only 1 person has shown anything close to Conqueror's in general right now among the admirals. But both of the old gen admirals had CoC, so new ones having it shouldn't be a surprise, rather expected.
ACoC on the other hand? Debatable:
Wouldn't be surprised if Oda goes the route of not giving all the admirals ACoC but simply at that top tier level through raw DF and Fighting skills. Would be more unique and interesting, particularly due to how well rounded the admirals are (in particular somebody like Borsalino). Very akin to people possessing COO, but not everyone possessing Future Sight. You don't really need ACoC to justify the admirals being above some of the Yonko and such.