Yi Deng's intelligence

I think Yi Deng's intelligence is grossly underestimated. He was able to learn Yi Yang Zhi to a supreme level (possibly the most powerful of the Greats next to WCY at Hua Shan Luan Jian 1). He governed a country that was quite sizable and powerful in it's time. He was well versed in art and poetry (as shown in his conversation with Guo Jing and Huang Rong when they first met). He also have considerable medical knowledge (as when he healed Lu Wu Shuang). Certainly, Huang Yaoshi was more inventive than Duan Zhixing/Yi Deng. However, Yi Deng was able to accomplish just as much with far more responsibility in his hands.

Agree with you since his disciple Zhu Zhiliu was one of smartest person at ROCH..
In "general knowledge" I think Yideng = Huang Laoxie but Huang exceed him in "divine art" plus he's more cunning and tactical (like Huang Rong) than Yideng

his internal energy and H7G are considered higher than Ouyang Feng and HYS ,
do you think who has a higher inner energy between Yi Deng vs H7G?

I would say they internal is more pure and orthodox than West Venom and East Evil but not "stronger" since The 5 Greats always "equal" in internal/external art..