this was the picture that prompted this post to start with. The angle that they shot this pic from makes the guy's arms as long and as wide as his legs are. (My proportions are a little different, i.e. legs are much bigger than arms.

)
Since he is in boxers, you don't really see where he is on his leg either.
POwerlift seems to be shooting the inside of his quad.
I dunno about you guys, but this thread cleared up some stuff and also showed that people do sh$t differently out there.
Bottom line is -- quads are great.