I read the question in the car, got home and looked and TM already had an answer...so credit goes...
Three do the same ^^^^^^^ One does not VVVVVVVVV
Three of them TURN THEIR BARREL TO FLATTEN IT.....as they PIVOT around the rear leg, from a WEIGHTED rear leg, AS they move forward. They use rearside resistance.....resistance BEHIND the rear hip/leg....to load with/against.
One does not. As he slides forward and shifts into the lead leg, he tips the barrel the wrong way.....HE REMOVES ANY RESISTANCE IT COULD OFFER....before any pivot occurs. In fact....that is why no pivot occurs.
The kid is coiling CLOSED as he moves out. The other three are turning OPEN as they move out.
The three....their hand pivot is pivoting WITH....yet AGAINST....the rear hip pivot....simultaneous. Rear hip is pivoting forward AS the hands are pivoting the barrel rearward. This is a CRITICAL loading technique.
The kid has no pivot in either his hands nor his hip.
So, if it's got something to do with barrel turn, (in your opinion) and Ruth and Suzuki do it the same, how come the power difference, (and it isn't just their size difference.)