If it's a coincidence, it would be too coincidental! According to Lin Mu's initial judgment, the Golden Leaf Sect Leader's death should have been caused by Qing Feng from the Dark Night Sect, and Qing Feng's aim was to seize the sect leader's position! However, aside from the coincidence, the Golden Leaf Sect Leader had already made a will concerning the succession of the sect leader's position!
According to the sect's regulations, if there is a will, it should be followed; if not, then it's based on seniority! This unexpected turn was not anticipated by Qing Feng! So in the end, Qing Feng acted against Xia Yuyi to obtain the sect leader's position! These deductions seem flawless, but...
According to Zhou Xun's account, it seems Qing Feng was not the person who acted last night! Lin Mu carefully observed earlier, and there were no scratch marks on Qing Feng's hand as Zhou Xun mentioned! This complicates matters!
