No, reread my post.
The SD was an organization under RSHA. In Nuremberg it was not tried together with the SS (if the SD had been a part of the SS it would have been tried as an SS unit).
The fact that the personnell in the SD were all members of the SS is irrelevant. You have to separate the individuals working in the organization from the organization itself.
Another example:
Even though all members of the SS Riding club (yes there was such a thing) were members of the SS and indeed it was a prerequisite for membership, that did not mean that the SS riding club (notice the name) was a part of the SS.
Sounds confusing enough for you?
(Hey, dont ask me, ask the Judges at Nuremburg).