The lawyer isn't applying the simultaneous catch rule properly. There is a difference between a catch and a completion/interception and the lawyer doesn't seem to realize that (it's the simultaneous catch rule, not the simultaneous completion rule). I mean, a player can catch the ball for an instant then drop it (due to hitting the ground or being tackled) and it's not a fumble it's an incomplete pass. Catching the ball is the first step towards a completion or interception and Jennings caught the ball. He then pulled the ball to his chest, controlling it, and went to the ground thus completing the act of intercepting the pass.
Tate can try and strip the ball from Jennings but Tate, merely by wrapping his hands around the ball after Jennings made the initial catch, can't be awarded simultaneous possession because Jennings already caught the ball. Either they both caught the ball at the exact same time or they didn't.
Just look at the image below. Jennings caught the ball. He has two hands firmly on the ball and all Tate has is some finger tips on the ball (maybe) and Jennings right forearm.
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I also see it the way you do.
But what the lawyer says is probably correct assuming #3 happened and the receiver got more than just fingers on the ball. The #3 point is a big "if".
So the whole thing comes down to "if" he actually got possession after the initial catch from GB. If he did, and then came down first, then it's a Seattle touchdown.
Some pictures seem to indicate that the receiver did get possession at some point, but looking at all the pictures and the whole video(s), it still looks like while the receiver was close to possession at times, it's probably the defender who had possession from beginning to end (by the time both men were down) and thus a clean interception.
The Seattle receiver may have wrestled the ball more towards himself after the play was over thus muddying what really happened. Maybe the receiver finally had possession after the play, but not before. It really doesn't matter what anyone does after the play in that dog pile so it would have been right to award Green Bay just like most fans see it. It's too bad Seattle got the nod on this one and they didn't do anything wrong, but simply tried their best to get a reception.