I think I've just figured out Naotora's stance frames with just a little bit of reasoning.
As you might or might not know, you can set up a fully charged unholdable Power Blow from a wall if your character is left at +30 frame advantage (FA) after a second wall splat. A fully charged PB has 60 startup frames (i60). You can set up an unholdable PB with every character in this way, not just Naotora!
I posted my unholdables earlier in
@KasumiLover69's W.I.P. Naotora Guide. Here I stated that if you follow-up any wall splat with 6PKK, Naotora's Ii Family Creed (IFC) stance 2K is unholdable. After you use 6PKK as a second wall splat, Naotora is left at +24 FA. Since she is left at
less FA compared to an unholdable wall PB, you need a move that is six frames
faster than a fully charged PB (i.e. 30 - 24 = 6). A simple deduction leads us to the conclusion that her IFC 2K must be i54, because i54 is
six frames faster than i60 (i.e. 60 - 6 = 54).
Note that IFC 2K consists of both the stance + the kick follow-up. Raw IFC 2K comprises three kicks which are i14, i7 and i7. However, you only have to take the first kick, which is i14, into consideration. Thus, we can can conclude that the amount of startup frames for her stance equals i40 (i.e. 54 - 14 = 40). Now that the amount of startup frames for her IFC stance is known, we can calculate the amount of startup frames for every move in her IFC stance.
2P+K (raw IFC stance) = i40
2P+K P = i81 (40 + 41)
2P+K K = i75 (40 + 35)
2P+K 2K = i54 (40 + 14)
2P+K P+K = i55 (40 + 15)
2P+K H+K = i61 (40 + 21)
2P+K T = i52 (40 +12)
Using these numbers, we can also calculate the amount of FA needed after a second wall splat to make the strikes (so excluding 2P+K T) from her stance unholdable. Remember that you need 30 FA to make an i60 fully charged PB unholdable.
After a second wall splat, you need 51 FA to make 2P+K P unholdable.
[...]. you need 45 FA to make 2P+K K unholdable.
[...], you need 24 FA to make 2P+K 2K unholdable.
[...], you need 25 FA to make 2P+K P+K unholdable.
[...], you need 31 FA to make 2P+K H+K unholdable.