So, if its that hard to do on both of your feet, in a strong stance... How much harder would it be to do that, standing on one foot?Even accepting your premise of pulling with the other arm. In what situation would you be able to pull a non complient opponents arm towards you?
And even if you achieve this hulk like feat, what prevents him from punching through your non existent guard with the other hand, right in your face?
Baseball players go to the on deck circle, and put a weight on their bat and start swinging it. Why? The weight only slows down the bat. You never see a batter in the box waiting for a pitch, with a weight on their bat. I have never seen a home run hit by a bat with a weight still on it. Why are they so stupid... putting weights on their bats? Maybe you should go help them stop that as well.