Correct me if I'm getting the wrong impression, but I'm getting a sense maybe this is where the difference lies.
Group A is maybe looking at Brown as having made one attempt at a catch that started when he grasped the ball in his jump and ended with him grasping the ball in his lap. They are maybe thinking "this means an OOB defender can touch a ball as a receiver is catching it and it will be incomplete and that is wrong". Which if that is how the rules read I would agree with them. Luckily, they don't read that way.
Group B sees two different attempts at a catch. There was the first attempt where Brown lost control of the ball going to the ground. Then later there was a second attempt when he secured it in his lap. In between it was a loose ball. It doesn't matter if the ball was in his hands but moving out of control, if it was resting loose in his lap, or if the ball popped up 10 feet in the air before coming back down and being caught. During that time it was loose, and it wasn't until Brown again got control of it that a catch was being attempted for the 2nd time.
The rules read the way Group B is looking at it. Any control Brown had on the initial attempt, or having 2 feet down, are completely moot once the ball moves as he goes to the ground. If he is going to make a catch he has to completely satisfy anew all the criteria for a catch.
So, if my guess is correct about how Group A is looking at this, no, it isn't a case of touching a ball in the act of being caught makes it incomplete. The ball was down because an OOB player touched a LOOSE BALL. It was not down because an OOB player touched a ball that was under control in the act of being caught.
If Brown had retained control of the ball on the 1st attempted catch, it would not be out of bounds. Because an OOB player touching a ball in the possession of another player does not make the ball dead. Only touching a loose ball while OOB makes the play dead.
I don't know, does clarifying that distinction help anyone? The offense is not being unfairly taken advantage of. Conceptually what happened on the play is no different if the ball popped up 10 feet and Lito touched it during that time, versus if it was still against his body but not in his control when Lito touched it.