I ment wasn't that what his tweet was about.
Having 3 Dog in wouldn't have made much sense but I would have loved for Erik to voice another character or at least have him be a alternate voice for the male PC.
He teased for a long time, maybe he was just trying his best to prove he really wanted to be in the game. I don't know. like you said, makes no sense.
I'm just sad that he's sad. The twitter teases were apparently for something else, since he confirmed later on he wasn't going to be in Fallout 4 as Three Dog.
How can you not?
He may have just been playing up a much less interesting conversation with Beth up to drum up interest. Or perhaps try and make a bid to get the character to return.
I imagine it may have gone something like:
Beth: "We won't say either way."
ED: "Threeee Dog may be comin' back folks!"
Kinda glad he wont be back, The whole 3 dog thing in FO3 was way over acted and in my opinion did not fit the setting at all, So I am pleased about the news.