Detailed sidewalk-line analysis of the fifth video: the legs appear uneven partly because the subject is sitting at an angle, not because one leg is shorter; multiple reference points show the 'short' leg is angled while the 'long' leg is relatively straight.

Mike uses the dark line in the subject's shoe matched against sidewalk cracks to track movement. Before healing: (1) the shin is 3 inches from a reference line; (2) the knee is 5-6 inches away; (3) the hip is further still — indicating the leg is at an angle, making the comparison unfair. The subject's toe on the 'short' leg is pointed, pushing the heel back, while the other toe is mostly straight. This asymmetry in posture/angle accounts for the apparent discrepancy without any actual length difference.