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that there was a very distinct difference between those two plays

On the one they called a catch, there was not any sign of him establishing control before going to the ground and the ball was moving around until he hit the ground at which point you can see 2/3 of the ball flat on the ground with no body part under it, so you have to assume the his hand was stapled to the other 1/3 you can't see, which is highly unlikely since ball was moving around until he hit the ground, showing ground helped him make the catch.

On the Int they called incomplete, you can see him catch the ball on his legs and gain control with his hand before going to the ground, then as he's being knocked to the ground you see the tip of the ball maybe even probably touch the ground, but the ball wasn't moving before this probable contact and didn't move after AND you can see his hand under the ball.

These were egregiously bad replay reviews.