With the new Star Wars being out for a while now we can discuss this theory openly without causing the keyboard warriors jumping on our heads for throwing out random theories.
So lets get started. First of all this video is a must on this topic. It covers all the basics on the topic
Doesn’t this prove it?! Even though he wasn’t in this new movie there is plenty of time for him to make his triumphant return as a master SITH! You can discuss further in the comments below. Also if you didn’t catch that – this is a joke. So don’t go berserk.