[deecee]

This looks like a casebook PC.

The offensive player was driving all the way to the basket. The contact by the primary defender is negligible as the offensive player did not make an attempt to pull up and shoot the ball. If you take away the primary defender and just look at it from the offensive player and the secondary defender you will have the same contact.

Unless the primary defender offers a shove in the back before the collision thats good defense and an offensive player forcing the action. No way I would personally have a block or a no call. PC all the way.

Cases can be made either way in a lot of calls however I truly believe that 99% of the calls are either "right" or "wrong". Here I think a block, push or no call is the incorrect way to go based on my reasoning above.