It seems that DCQ could have eventually gained access to all of the extremely powerful Xiao Yao martial arts. XWSG, Tian Shan Liu Yang Zhang, TianShan Tong Lao's BH6HWWDZ, Bei Ming Shen Gong, LBWB. Why did he give all of that up to study HGDF? It seems his teacher, Wu Yazi, gave him a lot of chances too, but DCQ kept trying to kill him.
Also, how much of a martial arts prodigy was DCQ? His Fu Shi Do, where he injects poison into one of his disciples before hurling him as a projectile is extremely powerful. He can even throw 9 poisoned corpses in a row. I assume the FSD was DCQ's own creation, showing that he was capable of inventing powerful skills, a rare feat that demonstrates his talent.
However, is DCQ talented enough to learn the cave carvings in XiXia's palace? It seems Murong Fu had trouble learning them, and MRF seemed evenly matched with DCQ. Even if DCQ had access to all the advanced skills like XWSG, Tian Shan Liu Yang Zhang, TianShan Tong Lao's BH6HWWDZ, Bei Ming Shen Gong, LBWB, does he even have the potential to master them?