My guy... that's called an example

.
My guy... KNOWLEDGEABLE ABOUT MARITAL ARTS

. THAT'S AN INTELLIGENCE FEAT. Nobody is talking about other types of feat.
And ig ur completely ignoring the consistency models too.
Imma make a syllogism for ur understanding.
P1: Gun is stated to know all kinds of martial arts under the sun
P2: CQC is a martial art.
C1: Therefore, Gun knows CQC.
P3: (authoritatively aproved): CQC is a 3x multipler
P4: Keisen Seiken is stated to be his strongest attack.
C2: Therefore, it's stronger than CQC any is a 3x+ multiplier.
Now consistency for C1.
P5: UI Daniel is stated to have combat abilities the same level as Gun.
P6: Combat ability here implicitly includes techniques and knowledge regarding combat variations or marital arts.
P2(pre established): CQC is a martial arts.
P7: (Objectively true since shown): UI Daniel knows CQC and is shown to use CQC.
C3: Therefore C1 is consistent.
P8: UI Daniel is also stated to know all material arts in a statement similar to Gun's.
P7: (Objectively true since shown + pre established): UI Daniel knows CQC and is shown to use CQC.
P9(from P7): Daniel's knowledge about all martial arts includes CQC.
C4: Therefore Gun's knowledge about all martial arts also includes CQC and adds another layer of consistency for C1.