So Gargano and Ciampa don't like each other. It's a grudge match. That's not a main event match. They aren't main event guys. Gargano can be, but Ciampa is not. Nothing in NXT has established them both as top guys where Almas and Black have. I would get it if Almas and Black had no build up and it was just a random challenger. There is a story behind this as well though. I also don't think Gargano and Ciampa can have as good of a match as Almas and Black.