Duh I just thought about what I said and of course you're right... in this specific case, any overcard would have to be the A, which means that with two A's in play, they're drawing semi-dead to one another.
I bow to your superior intellect, good sir knight.
However, I do think my base argument has some validity. I think many times players, even GOOD players will memorize statistics like you just quoted, but forget that the odds change, and sometimes drastically when faced with a three-way or more-way pot.
Anyhow, yes you're right and I'm wrong on this one.