"Owning the bomb" is one of my pet peeves. Who gives a shit about the legality. I want to make sure that I've sent a correct 9-Line up to the aircraft. Why? That's my life and the life of my Marines on line. The attacking aircraft wants to make sure they're releasing the ordnance in the right place. Why? Those are his fellow countrymen. If I never hear the term "own the bomb" again, it'll be too soon.
I think it's a matter of perspective. You were (or are...is there currency?) a FAC, so you know that people expect you to be giving the specific info. Someone like myself who isn't a FAC and knows I don't have the training or accuracy (or the gear, for that matter) to give that specfic information, wants to make sure the attacker knows he's the final check. Should he be doing that anyway? Of course, but I think you get what I mean.