The other two have less direct proofs for now, but imho It doesn't make much sense having 5 out of 7 past/future Admirals yes and two no: Sengoku, Akainu, Kuzan, Koby and Issho yes and two other no?
I don't think Oda sees Kizaru and Aramaki in any way weaker than the other "Admirals", let alone much weaker.
That aside from the fact of the black blade or Kizaru actually showing to be very autonomous.
In a world where Kata, Chinjao or Yamato have It, the Admirals are a sur bet. But I mean, Chinjao himself said there are countless:
Countless
I don't think Oda sees Kizaru and Aramaki in any way weaker than the other "Admirals", let alone much weaker.
That aside from the fact of the black blade or Kizaru actually showing to be very autonomous.
In a world where Kata, Chinjao or Yamato have It, the Admirals are a sur bet. But I mean, Chinjao himself said there are countless:
Countless
If 3/5 of the admirals have it, all will. If only Sakazuki and Kuzan/Issho have it, I can see it going differently