It's worth breaking down what data on Smith's BC has and hasn't been verified. Because it falls into rather neat categories.
The first is any information about Obama that was public knowledge before Smith published his document. Family names, dates, birthplaces, occupations. All of this checks out, but then, it was public knowledge, so any competent fake could and would have simply copied the known information. So the fact that that information checks out is hardly evidence in favor of its authenticity.
The second is information about Obama that wasn't public knowledge. Height, weight, width of shoulders, the footprint. This information has NOT been verified. Similarly, there's no birthdate for Obama Senior. (Is it because Senior didn't know his own birthday, or because Senior's birthday wasn't public knowledge when the document was created? If Senior's birthday is reflected on, say, his college records, that would hurt the provenence of Smith's BC.0
The third is hospital data. The certificate number, the doctors' names. The most that's been verified here is that at least a couple of the doctors were real Kenyan doctors. But all that proves is that Smith didn't make the names up; it hardly proves that he didn't seek out the names of real and plausible Kenyan doctors beforehand. Similarly, we don't know if any of the signatures are matches. Thus, none of this data speaks strongly for the provenence of the document.
Also unverified are the seal, the administrator's stamp, and the general form of the document. We don't know if Coast Hospital uses a stamp that looks anything like that, or if they issued birth certificates that look anything like Smith's.
In short, the only data on Smith's BC that has been verified is the same data that Smith could have procured prior to August 2009, when he released it. So you can't trust the data alone to establish the document's authenticity; you have to turn to the credibility or the provider or some other means of authentication.
Agreed.