Emphasis on "probably" there, it's just not a guarantee. Not to mention that given the Garleans had no information on the Echo, it's very likely they are physically incapable of awakening it naturally. This would explain the dreams (As his recollection of Amaurot is the most vivid of anyone by far), and also why he never manifested the power.

As to his personality, of course he isn't ALWAYS hamming it up like a madman, but then again neither is Fandaniel, in his first appearances he wasn't nearly so over the top. The point here is that they both share these traits as well, even if they're not perfectly balanced.

Hell it's not like Ardbert was EXACTLY like WoL either, they're very alike in many regards, but also differ in others. Frankly I'd say Zenos and Fandaniel are even more similar.

Of course, it's also possible Fandaniel is simply making his entire personality up just to get Zenos to play along, not that he seems all that enthused about it.