The play there was to corners. Corners cutting to the basket. The down low defender covered the middle and the corner. He picked up Cliff on the roll. The corner was wide open. These guys need to know to go to the basket w/o the ball. Cliff never looked for ball on roll.
But it was either to cliff or corners. If they just moved the ball there were lots of layups to be had. It wasnt a great defense but doesnt have to be when the corners possess zero playmaking ability and just stay in the corners.
PM is tall enough to hit the cutters to the hoop.
When they doubled ball screens, they have a 6'9" to 7'0" guy running at the ball handler with hands either on the ball handler or up - it is difficult to make a pass to a corner against that. I agree that is what's open, the defense leaves that open for a reason, it's a tough pass to make.
On those aggressive doubles on the ball screen, two good options are for the screener to leave early and get the ball in the middle of the court and have a quick opportunity to play 4v3 (I love watching Draymond Green in this role) Cliff can't do this. Another solid option for the aggressive double off the ball screen is pick and pop, that's a much easier pass to make for the doubled player - nobody wants to see Cliff pick and pop.
If we're going to focus on ball screens so much, I'd love to see Cam set some of them. He could be good in the middle of the court or pick and pop.