I just thought it'd be interesting if they had also tried the swing in the way the stunt performers had done it and see if it was any easier than how your eye tricks you into thinking they pulled it off (i.e. side-by-side). It looks like Leia's double was the one actually controlling the inertia in that shot as opposed to just hanging on.
Well, the idea of testing movie myths is to test the way they were supposed to happen in the story. The stunt work, editing, etc. created an illusion, and it was the illusion, not the reality, that the Mythbusters were testing.