the problem with foot prints is that a foot print is in the past! foot prints will not help in your quest to understand the market... a good criminal or trader will mask the footprint so you won't know what is going on .. even put up fake footprints in teh wrong direction... serioulsy do not waste your time on market delta or any other foot print..
sometimes huge option volume can tell a story, but most people are hedging when you see those enormous orders so if they are wrong they almost break even..
good luck to you