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Very true. The two Sith thing was always self imposed anyway, and a bit bonkers given the number of "secret" apprentices knocking about all over the place in the Expanded Universe (even if it's not canon any more) and in bits of the prequel films and Clone Wars cartoon.

Supreme Commander Snokes is the other one (at least it would seem so) and that character isn't human.

Yup, also a valid interpretation. I just don't think he'll be Luke, it'd just trash his arc.

I think it's just a "I'll fulfil the destiny of the Sith" thing, rather than it being Luke.