There is yet another problem with your conclusion. You are assuming that birth certificates were given numbers in serial order, depending on the time of birth. We don't know if that was the strict rule at the time.
BTW, the reappearance of the elderly Mrs. Nordyke in the Advertiser at this time, displaying her daughters' birth certificates, could well have been planned by the Obama team. Though I believe those Nordyke BCs are authentic, they don't prove a darn thing as to where (or when) Obama was born. Mrs. Nordyke could be telling the Advertiser what she was told to say: that she remembers seeing Stanley Ann in the maternity ward at the time, when in fact she doesn't.
One more point: if the Dept. of Health reported all births to the newspapers at the time, why weren't the Nordyke twins' birth announcements in the same issue of the Advertiser as the Obama birth announcement?
Good Point --