Gwok Jing is commonly accepted as the dumbest of all JY's protagonists, yet he arguably became the most powerful martial artist of his time. He wasn't even smart enough to tell that his future wife was a girl! What a moron! None of the other protagnoists was saddled with such stupidity. The closest case to GJ would be XZ but XZ was given much more freebie power than GJ, so XZ doesn't count. I would argue that GJ"s stupidity is a bigger handicap than YG's loss of one arm. Since GJ is the only character to be burdened with such idiocy, he must truly be the ultimate super greatest martial artist of all time.