I'm always willing to learn....now what I did here was strictly focus on his back toe and ran the clip with my finger on the pause buton. As soon as I noticed his back toe moving forward (it does) I paused, guess what its at contact. I'm not saying some don't but it is just really rare. As far as Romero I actually looked at several different video and they do seem to vary but she does seem to be more anchored than most but when she wants maximum power in her swing....see below...just sayin. Mind you I am not saying it is something you have to focus on intensely it's just something that will happen if all your other mechanics are correct and if you are not doing it I have no problem prompting with a make sure you are giving a good push off hard with your instep as you initiate the swing cue
What i am amazed at in the video is she never hooks one of them.