I have read several articles as well. It seems to me it is more about how the plays are called than what plays are actually called.Thanks for clarifying. Since all of this EP debate, I've been reading a lot of articles on EP. I didn't really know what it meant. From what I've read, you are correct.
So when someone says Watson can or can't run EP, they basically don't know what they're talking about. It would be more correct to say Watson can/can't run BOB's offense.
Here is an excerpt from an article written in 2014. All of the articles I have read said just about the same thing.
"Erhardt-Perkins Offense - The unique trait of this offense is the way plays are organized. Instead of long cryptic names or a numbering system, they are organized by "concepts" that are visualized often by a single word. The word might be "Choice" or "In." All receivers memorize all of the routes associated with this concept which allows a great deal of flexibility by allowing different receivers to line up in any of the alignment positions. And it is much easier to learn, and thus leads to less mistakes. And it also has a lot of different looks and is not simple to defend."