I thought refs needed 100% certainty to change a call?

The refs speculated that Bryant was not reaching for the end zone, that he was just trying to hang on to the ball with an outstretched arm. It was called a catch on the field because he clearly made 2 or 3 football "moves" or steps and was totally in control of the ball. What caused the ball to come loose was the ground. If he clearly had control of the ball (he did) and he clearly made at least two steps (he did), then the ground cannot cause a fumble (it did). That was probably a half a billion dollar reversal with all the money that was on the line. For what it's worth, I hate the Cowboys. Since that play was not considered a catch, the rules need to be changed. Dez was reaching for the goal line like he has been doing all season and the refs didn't see it that way. They should not have reversed the call unless they were 100% certain that he WAS NOT reaching for the goal line. /rant