The Martinez penalty was BS; but ya gotta give the refs a break based on what they may have seen in real time. If that was reviewed, I'd bet the flag gets picked up. Not sure this stuff should be reviewed, it's lead to 3-4-5 reviews per game.
PFWT,
The play before, McCarthy challenged the spot of the ball where Beasley was tackled.
Elliot was tackled and ball spotted 1/2 yard short, that spot was reviewable and it was correct, that's where Elliot was tackled with the ball. But, the refs didn't review the spot of the ball; they reviewed the point of Elliot's most forward progress [the reach].
Forward progress is a judgment as to "when a runner is held or otherwise restrained so that his forward progress ends." Of course, once a ref believes FP was achieved he blows the whistle. The review doesn't let us know when the whistle blew, nor can it be used as a substitute for a ref's judgment call.
If they saw the ball extended and Elliot's knee or elbow down, then okay, that's reviewable and I get the reversal. But, Elliot had flown thru the air and landed on a pile of bodies; he was not down unless a ref judged his forward progress stopped. Had he got pushed back and landed on his feet; he could have kept running first down around end or tried diving again, unless play was blown dead.
Note: if Elliot pulled ball back on his own accord, then that's is not the point of forward progress!
Note: On GL, the forward progress doesn't come into play because once the ball breaks the plane, the play is dead.