Rational,
RCA is a Rabbinic Membership Organization. To become a member one must have an approved smicha. RCA does NOT issue smicha.
I haave heard of RCA, apparently while you have heard of it, you do not know what they do.
BY the way, they refer to primary leader as R Joseph B. Soloveitchik, ZT’L, not as DovBear, who is a small minded blogger.
The Agudah is not a Rabbinic Membership Organization. It to does not issue smicha. Agudah is a services and representational organization.
ZDs question therefore makes no sense.