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In a small system, it can make sense to have site admins be members of org admin group. However, I want to caution you that this can create significant problems if that user is not VERY CAREFULL when performing administrative actions. An Org Admin, who is not a Site Admin, can never "damage" the site level settings if he makes a mistake in understanding which context he is working in. However, a Site Admin, who is working as an Org Admin, does not have that protection. I have seen many cases where site level settings and configurations have been inadvertently overwritten by a user who is both SIte and Org Admin. I strongly recommend against this, unless you are willing to be very, very careful and also willing to tackle the difficult recovery issues when Mr. Murphy strikes.
Russ