It seems to be company policy to make almost all free agents go thru nxt, so it's hard to really say if and when the talent would be making it to the network shows.
I was at a ROH show last week, there was plenty of talent there that has hype (briscoes, young bucks, cole, lethal, Dalton castle, etc) but I don't trust them to get any of them over or not fukk up what makes them appealing in the first place. Kenny Omega could be a star with enough exposure (and a proper working visa) but I have no trust in them to actually make it happen. Once you're on the main roster(s), unless you're as good as Styles it seems like a total crap shoot with the odds stacked against the talent.