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Recently, the disdain for Qin Lin in the martial art world has become increasingly severe, with even juniors like Jiang Muchen expressing their contempt for the Qin Alliance Leader early on, let alone other highly respected veterans of the martial arts community.
So, the absence of the sect leaders was a statement—if the position Qin Lin obtained from the previous head of the Martial Arts Alliance was dishonorable, then it wasn't worthy of respect. Even if his position as the head was legitimate, the man himself was not; he was incredibly hypocritical. Given his dubious character and the controversy over his position, why should these sect leaders give him any face?
A sect leader is not necessarily weaker than the head of the Martial Arts Alliance.
Therefore, since the sect leaders did not attend, Qin Yu guessed that these people must have been in cahoots behind the scenes.