SPECULATION The possible main Villain in the Ep.VII

Hello everybody this is my third thread since I'am a member.
I did a little mind game some minutes ago and I don't know if this is thread material but nonetheless I will post it, just for fun.
Maybe I have puzzled the actor who will play the main villain for Ep.VII or for the whole ST. (a big mabye)
Don't flak if I'am wrong or this is old news in some way or another.

I was just puzzling with the OT and PT henchmans.
Darth Vader, his body was provided by David Prowse and voiced James Earl Jones.
Darth Maul, the body was Ray Park and the voice was Peter Serafinowicz.
Darth Tyranus, Christopher Lee, well this is a different beast, he has the right look and voice.

Darth Sidous, Ian McDiarmid both voice and body but I will not count him, because his role was predetermined since RotJ.
He needed to get cast again for the PT, he is not a henchman but I wanted the list complete with all movie Darth's for the sake of completeness.

I thought, maybe J.J. Abrams will go retro, but this time vice versa. (recreating A New Hope)
He wants a different body but he intends to use the voice of the actor.
A reversed situation from Ep.IV, the right voice but the wrong body for his main villain.
It would be a double vice versa, not the henchman, but the main villain would be created from two different sources.
The only person who fits this criterion on the casting list is Andy Serkis and his mo-cap backround.
Serkis could provide his voice and motion capture work for the CGI character.
As the teaser trailer showed us, he can disguise his voice and it sounds good, but his look is not intimidating enough.

I know that Kylo Ren is considered the new henchman and Andy Serkis as the possible Sith Lord, but I just wanted to contribute my reasoning to this board.
What are my fellow members and moderators thinking about this speculation?
Complete wrong or maybe on the right track?
Please feel free to contribute.

Eidt: if there is already a thread open about this, please mods feel free to move this thread, thanks in advance. (I did not find one on the fly, sorry)