One thing you guys are overlooking, which is a HUGE factor in kingfishs ankle dorsi flexion is he is purposely squatting on the front of his feet. Even with weightlifting shoes on his heels come off the floor at times. This will drastically alter the perception of dorsi flexion in a normal squat with the weight on mid foot/heel. Hes obviously adapted to this and his knees are fine, but trying to copy that aspect of his squat will hurt a lot athletes who are not Kingfish and do not have his proportions nor time spent building strength in that movement pattern.