Yep, he's a great heel. His matches with Johnny Gargano and Aleister Black were the highlights of several Take Overs in NXT. He had a classic with AJ on the main roster too. He needs a manager on the mic, hence pairing him with Vicki. Dude had a bunch of titles in Mexico. I hope they have him feud with Penta to start.
I'm not sure either, it's been a while since I saw anything about it.
Britt Baker and Adam Cole seem to make it work. Jon Moxley and Miro don't have to worry about it anymore since Lana and Renee Young aren't in WWE anymore. I bet it's really hard if you have kids in the mix.