I'm to technologically illiterate to edit my identity out of these video's or I would post some dead lifts. Regardless, in a proper conventional DL legs don't do much work. Also, the picture of the posterior chain would be correct but it forgot quite a few muscles used during the DL exercise when performed correctly. It isn't a leg day movement, unless you are pre-fatiguing your lower back before squats, which some programs actually call for...tried that and fuck that. We are all on a different page as far as programming and style of lifting goes, some bb's, some pl's, some in between, so I can't say anyone is wrong, but I would advise training deads with upper back, instead of legs. My .02