To me, that ball would have been intercepted no matter what Luke Kuechly did or didn't do. Gronk's momentum was taking him to the back of the endzone anyway. No way in hell he comes back to that ball to catch it in a million years, or even prevent the INT. That would defy the laws of physics. That ball was going to be intercepted no matter what from the moment it was thrown.
I'm saying that it wasn't pass interference, in my opinion. And, yeah, the ball WAS uncatchable.
However, I think that it WAS defensive holding. I can't see how they don't call THAT, especially when the flag was already thrown. The ball should have been placed on the Carolina 13-yardline (not the goal-line), and the Patriots should have gotten one more play...1st-and-10 at the 13, with one more shot. According to the rules, that's the thing that should have happened.
Who knows what would have happened on the ensuing play? No reason to think that the call itself was the reason the Patriots lost the game, even if you DO think it was pass interference. What happened was that bad officiating took away the Patriots last play...the last chance at a winning TD. And that's just based on the stupidity of Kuechly, who didn't even affect the actual play itself. I understand the frustration, but some people act 100% certain that this call decided the game. It didn't. It just took away the Patriots last opportunity, in my opinion. Scoring a TD on the 13-yardline in one play when it means the game is not a high-percentage proposition.
Some people try to liken this call to the "pushing into the pile" call in the Jets game, too. While heartbreaking, it was the rules. Talk about the tuck rule instead, which help to trigger a dynasty. The Pats will make the playoffs anyway. No way they don't win the division again.