Or someone has admitted it's a valid concern?

If you're referring to the former then you're wrong. Obama has only ever produced a certification of live birth, which is not a birth certificate and significantly easier to obtain. In the state of hawaii these count for the same thing. however they are, strictly speaking, not the same. And this is so for a reason, I presume.

Again, not questioning it, I just think it's stupid not to put a rumor which is so easily quieted to rest.