The Green/McClarin discussion (between themselves) is on YT. McClarin is quite sure he was stepping "within inches" of the trackway. He says there was still some plaster residue to observe. He also had been to the site a few days (or maybe it was a week) after the PG filming , so he knew the trackway well. Green is considered to have been within a yard of where Roger was filming (they triangulated it repeatedly until things lined up), and knelt down to mimic what Roger had to do. So its a very good re-creation. Even Packham in the (skeptical) BBC documentary admitted that Patty was "just a few inches taller" than McClarin, but that puts the subject at 6'8" or more. And that's in stride, hunched over. Standing height would be more (there's a formula for it). Seven feet even is not out of the question at all.