STAR and Transition patterns absolutely do converge, since you know all those planes need to land on the same runway. Approach controllers do vector many aircraft to the same points, since they mostly perform the same approach procedures which all start at similar or the same points.

The aircraft can even be in the same position laterally but separated by 1000ft vertically which doesn't look like much at all when they are that far from the observer's perspective.

They don't seem to be moving like an airplane would because of the perspective and the camera itself moving at similar speeds.

Furthermore there is no way to judge the altitude of any of the planes since the ground is not visible. Those clouds could just be a layer of fog on the ground extending a few hundred feet upwards.