Establishing one's self as a runner is entirely vague. What is a runner? Isn't someone who's diving to the ground not a runner?The rule now states that a receiver must establish himself as a runner rather than just make a football move.
As per the Dez no-catch, I think he made a clear and defined football move. I don't think it should've been called a catch because he didn't complete the process of going to the ground, but he did have the football move in there (reaching for the goal line). But how the hell does one establish themselves as a runner?