It's impossible to tuck the ball in one hand if you don't have control of it. If you think tucking the ball happened before the second foot was down, then you can look at the lunge as completing the catch process. And even if you think that wasn't a lunge, the most obvious football move is the reach. A player who has control with two feet down, then reaches with the football, has clearly gained possession of the ball.
So, when he reached with the football, you
know he must have caught it. Reaching for the line of gain is an act common to the game, and in 2014 an act common to the game completed the catch process, whether a player was "going to the ground" (falling) or not. When interviewed a couple of hours after the game, Blandino said the reach "needed to be with two hands, extending the arms." But the rules say he had to show indisputable
proof that there was
no act common to the game (in this case, no reach). So some time during the next 24 hours, he shifted his focus to an easier target -- the lunge. Here's his conclusion:
"This was indisputable to us that he did not perform an act common to the game. That has to be an act where I gather myself and I lunge."
All right,
maybe it's easier to buy the "not enough of a lunge" explanation, but what happened to the "reach needed to be with two hands" explanation? He obviously thought the lunge explanation was better, so he would use that as the new justification for the overturn. And everybody is just supposed to forget about what he said before. In any case, there can be no doubt that he had to show indisputable proof that Dez did not perform an act common to the game. The NFL spelled it out clearly
here:
"The issue: whether Bryant performed an “act common to the game.” Under the rules, that could have made the play qualify as a catch, and the key question was whether Bryant was doing so by clearly reaching for the goal line."
It wasn't until weeks (months?) later that we started to hear things like, "the act common to the game doesn't matter when you're going to the ground." At that point they knew the rule had changed (or at least was in the process of changing) so that the standard for completing the catch process would change from "performing an act common to the game" to "remaining upright long enough." That new rule meant that a player could no longer gain possession of the ball while falling.
Why? The knew they couldn't say Dez didn't reach for the goal line, so they had to come up with a way to say he reached for the goal line
without possession of the ball.
Just like before, we're supposed to forget the previous explanations. We're also supposed to believe the rule didn't change. That way, they can point to the current rule as justification for the overturn. Which they absolutely do, and which is echoed by everybody who defends the overturn.