I don't think the American Wolves need anyone or a mouthpiece. They already have a badass persona.
Bad ass persona can only get you so far if you cannot speak. Neither Davey or Eddie are master mic workers and on the big stage and slightly smaller stage of WWE and TNA respectively you need to be able to talk to get over. Their biggest chance of learning that is with the WWE. They made Bryan Danielson, who was an okay speaker into Daniel Bryan who is a really good speaker.
And to tie in to your original post. I don't see Davey or Eddie surviving as off the bat singles stars in either company, they need to be brought in as a tag team because that is where they cover up most of their flaws (lack of psychology in matches, no selling American strong style BS and lack of mic skills).
This is coming from a guy who is a fan of both guys. I want them to succeed and with the way TNA seems to be in organizational shambles right now with all the releases I hope they go to the WWE. Working in NXT is not a demotion and would only benefit them.