Q. Do you think Yogg-Sothoth was an Old One or an Elder God?
My initial response was to cite my belief that the two terms are, not necessarily, mutually exclusive.
I’ve always considered Yog Sothoth to be something more than the likes of Cthulhu and Azazthoth – in the same way that Nyarlathotep is something less. After all, Yog Sothoth is the Lurker on the Threshold – this eldritch entity that inhabits the Bits Between the Bits.
A brief google shows that most followers of the Cthulhu Mythos seem to view Yog Sothoth as an Elder God or at least an “Outer” God… Nyarlathotep and Azathoth are also deemed to be Outer Gods; Azathoth is even placed alongside Yog Sothoth. So I accept that my initial reaction was incorrect.
One good thing to come out of this brief study is that my assumptions surrounding Tsathoggua (probably my favourite Cthulhu Cycle Deity) are correct. To my mind, Tsathoggua is the definitive Old One. Good old St. Toad.