Gait detection not likely to be useful in a massive crowd. Clothes are not custom, change over time, and can't be used to identify someone because they aren't l

Gait detection not likely to be useful in a massive crowd. Clothes are not custom, change over time, and can't be used to identify someone because they aren't linked to an identity (Joe buys John a shirt as a gift; John buys his son a shirt; etc.). I suppose rewinding is possible but the computational cost of doing this for thousands of people is probably immense.