Besides, what sense does it to pull this from deep down the EU rabbit hole? Obviously, yes, I recall Palpatine's story of Plagueis, but why would they choose to go back to that? Why when JJ and Lucasfilm have decided they don't need to pull all that much from the overly bloated EU would they pull a character who while had certain implications for the story, never actually appeared in a movie?
I'm not saying there aren't aspects of the EU they're using. I bet there are. But a character like that? Who Palpatine said he killed in his sleep? Yeah, it would just be way too much fanwank in my opinion.
Snoke is Snoke.
Plagueis is dead.
If I'm wrong, I'll be happy to admit it. But now, I just don't see it.
We all know that truth is told in the Star Wars Universe from a "certain point of view" so who knows if Palpatine was telling the actual truth or blowing snoke up Anakin's ass.
There is no reason for Snoke to be a significant character other than some vaguely defined evil that motivates Hipster Vader to go out and resurrect the Sithstreet Boys. So it would work for him to actually b e Plagueis who floated through the last few decades like smoke, unknown to his powerful descendants.....