Nice clip. Notice how Saito sensei doesn't step back but moves to side and at the same time drops a little and get under uke. Easy in gotai, much harder in jutai or ryutai.
I also like this clip. This is how I like to think of kata-dori. Pay particular attention to how he says not to use the hand, but to use the shoulder to move uke.
Why is this harder in jutai or ryutai?