re: Steelers had the fix on them

Right call. Questionable rule.

You must control the ball through the ground. He didn't.

And he didnt established himself prior which is key: it would have made it a TD as soon as the ball crossed the plane.

Think about it this way. If that play didn't happen in the end zone, it's incomplete. Or if it came loose from a defender making the hit (instead of the ground) just as the receiver came down with ththe ball, it's incomplete.

You have to establish possession where losing it would make it a fumble. He never established possession.