Exactly. When the review went our way in the KC game it was explained that the replay ref is able to look at everything that happened on a given play once it is in their hands. If they are asked to review the spot of the ball and they realize there was a fumble on the play...they can report that.
IIRC, on the play with Cam the challenge was whether it was a forward pass or not. Once they ruled it was even though he was twisted...they should have looked at the lack of any receiver in the area.
From what Hochuli said, I think they ruled that it wasn't a fumble because he was trying to throw it forward but the contact made the ball go backwards. If that's the rule I'm fine with it. But they didn't explain the receiver in the area since there clearly wasn't one. My guess was they were saying where he INTENDED to throw it, there's a receiver in the area, but the ball went the other way because of contact.
My problem there is I thought the rule was pretty clear, has to be outside the pocket(he wasn't) and has to throw the ball past the LOS(he didn't). If they're saying the contact was so severe that it completely changed the direction of the throw, and made it fall that short, then I don't know how you can ever get a grounding call when being hit, you can always argue the hit caused the throw to change direction.