Kata has changed over the years, sometimes because people forget and change a technique in  the kata by mistake.

You  must also consider we are all different, some of us are more flexible than others and it depends what kind of muscles you have. Fast explosive muscels or slow muscels.

But now because of the introduction of competion students are chaging the kata in order to win a competition. Kata competition  has changed  the essence of Kata, many things have changed and unfortunately for the worst. Changing technique trying to make it look better for the judges etc. Changing the timeing etc emphasising the wrong thing. Kata was not meant for competition it was made for self development. I filmed these kata a long time ago before competition came along.