Gryphon, Raiu, and Rayleigh's Sword are good candidate for Saijo O Wazamono.
Assuming Napoleon is also Saijo O Wazamono, there will be 7 sword in that grade.
The remaining 5 could be between Durandal, Oto and Kogarashi, Fujitora's sword, Koushiro's sword, and some unseen sword (may belong to Greenbull, WG, Giant Warrior, Moon People, Tashigi's future sword or Wano's unseen treasure).
If Roger's sword isn't Gryphon, then it is highly likely will be included in that grade too, making only 4 remaining sword that could be included in that grade.