I am not a replay expert, even though I worked with it for a number of years in my FBS days. (It was far simpler, then, and we didn’t have targeting as we have it now). But, I believe the “clear and obvious” language is there to allow the RO to initiate and create a foul from the booth, when it isn’t called on the field. In practice, NCAA guys have become pretty good at calling anything suspect, and letting the RO take them off of it, if necessary. So, that language isn’t needed, much. But, it is there in those unusual-to-rare instances when it is needed.
I believe.