Did C3F teach Mo Dong's 9 Yeung Technique to anybody other than CMG?

[Ken Cheng]

After Gok Yeun the Monk died, his sect brother Mo Sik, Gwok Seung, and Cheung Gwun Bo each memorized a portion of the 9 Yeung Jen Ging, resulting in Shaolin, Ngor Mei Sect, and Mo Dong Sect each having a part of the 9 Yeung Jen Ging as part of their schools' martial arts by the time of HSDS.

At Shaolin, Yeun Jen (Sing Kwun) learned Shaolin's 9 Yeung Divine Art (and probably so did the Hung-generation monks); at Ngor Mei, Mit Jeut See Tai demonstrated the skill; at Mo Dong, Cheung 3 Fung taught it to Cheung Mo Gei so that the boy could preserve his own life after being injured by Yeun Ming Divine Palms, but other than that, did Cheung 3 Fung teach it to the Mo Dong Heroes or any other Mo Dong Sect members?

[Western Eccentric]

If I'am not wrong Wudang have skill named Wudang 9 Yang Shengong which quite different with 9 Yang Shengong but have many similarity and become Wudang main/basic inner strength method..

[Doc Kwok]

At Shaolin, Yeun Jen (Sing Kwun) learned Shaolin's 9 Yeung Divine Art (and probably so did the Hung-generation monks);

According to the 1st edition of HSDS, only Kong Jian learnt the Shaolin 9 Yang, which he passed down to his disciple Yuan Zhen. The other monks looked down on it because it was passed down by a 'traitor', despite being very powerful. Presumably Kong Jian learnt it anyway because he was more open-minded compared to his juniors. This passage was deleted from the second edition onwards.

at Ngor Mei, Mit Jeut See Tai demonstrated the skill;

Zhou Zhiruo also demonstrated it when she deflected Yin Li's attack. From YL's comments, it seems to be a high honour for a Emei student to learn it. Miejue seemed to be very miserly when teaching her students - the novel said that she taught Song Qingshu more diligently than her own students after he flattered her some.

at Mo Dong, Cheung 3 Fung taught it to Cheung Mo Gei so that the boy could preserve his own life after being injured by Yeun Ming Divine Palms, but other than that, did Cheung 3 Fung teach it to the Mo Dong Heroes or any other Mo Dong Sect members?

Z3F said that the Wudang martial arts were mainly derived from the 9 yang manual. So presumably, it was part of their core curriculum, though maybe not in the form that Z3F originally learnt it.

[Trien Chieu]

Probably NOT. The future generation of Wudang does not seem to know anything about 9-Yang. In SPW, the leader of Wudang does not seem to know anything about it.