All of those guys are gripping from a very very weak position. It proves that Kuzushi before applying a technique is very important!
I like the way he slides away from his uke right at the start.
The weak gripping helps what he is doing with his arms, but it would work anyway. Even if the grips were strong, no matter. What actually is
going on is blatantly obvious if a) your body is trained b) you understand aiki. The rest is a piece of cake.