Those pictures were from a few months ago when I got my bodyfat using the parillo caliper method. It was actually 5.9% based on the caliper measurements, which being honest I should round to 6, not 5. And with the margin of error, your right, it could easily be 7 or 8 percent.
I think my legs are proportional (if not one of my better parts), actually the only place I have gotten stretch marks from body building is on the top front/outside of my thigs. I am a huge believe in deep squats. I go currently go deep-thighs below parrallel-for 6-8 reps at 275lbs.
I don't think I will ever compete, but hey, its fun to dream. With how hard it has been for me to get where I am from where I started, putting on another solid 20-25 lbs sounds daunting, to say the least. I have never don a
real cycle though, and I don't know if I'd have the balls (no pun intented) to do so.
I just like getting looks at the beach.
Peace.