He would add more tricky moves and feints to it, maybe 10 more? And it would be called 28 Dragon Palms.
Now back on the subject of ' would YG make it under GJ'. How about looking at it another way?
There are so many elite fighters who learnt their crap from a bloody manual without a teacher. If the student had potential, did you really need a good teacher as long as the art was good and the teacher could recite it? As long as GJ could recite the Quanzhen formula to YG and the 9 Yin to him, he really doesnt need to 'teach' YG much at all.
Its BIxie Jianfa Gawdammit you guys!!!!
Gwok Fu and the Mo Brothers were too untalented and subpar to be good standards by which to evaluate Gwok Jing's ability as a martial arts teacher, whereas Yeung Gor was too talented and superior. Perhaps we should examine someone in the middle, such as Yeh Lut Chai. Yeh Lut Chai's talent was far better than Gwok Fu's and the Mo Brothers', but considerably inferior to Yeung Gor's.
Yeh Lut Chai learned the complete Hong Lung 18 Palms from his father-in-law, and by the end of ROCH, was able to defeat Fok Do in a fair fight (Fok Do had to cheat to defeat him).
Yelu Qi managed to learn Quanzhen arts to a pretty high level (better than any of the 3rd gen Quanzhen disciples at the time) from limited tutelage by Zhou Botong. Although knowing ZBT, the limited time he spent with YLQ probably packed in extremely intensive training.
Just my feeling since Shi Huolong could fought almost evenly with Cheng Kun though he died after this fight but he could injured Cheng Kun so his skills should be only one or half notch below Cheng Kun in the other hand I think "full-mastered" 18 Dragon Palm YLQ more or less equal with LOCH QCJ or even below LOCH QCJ since GJ even still inferior to OYK after he learn complete 18 Dragon Palm from H7G so YLQ logically not better than GJ at that time which inferior to OYK and far below Cheng Kun level IMHO which mean he also inferior to Shi Huolong..
GJ even with 18 Dragon Palm + 9 Yin + Vacant Fist + L/R Hand Skill only a bit better than QCJ or MCF so full-mastered 18 Dragon Palm YLQ logically should be around GJ level at best or even worse than GJ at that point..