Respectfully, I don’t understand how people are having a problem with the INT.
Pretend there was no DB in the area. Cooks goes up for the catch. He catches it for a moment but when he hits the ground he loses control and it falls out of his hands and flies up into the air. Presumably it would eventually hit the ground. That would be an incomplete pass, because he did not survive the ground. We all agree, right?
This is the same exact thing; the only difference is that when he lost control of the ball when he hit the ground, there was a DB right next to him who then took the live ball himself.
The ball never became an incomplete pass because it never touched the ground, and it never became a completed pass for the offense because the receiver did not maintain control through hitting the ground with his body. It was an INT because the ball landed with the DB who maintained control through the ground.
Everyone is forgetting the whole “maintain control” aspect of catching a pass. The receiver can’t just have it for a fraction of a second with his knee down for it to be complete. It needs to complete the entire process.