That's the point though. Get the Indy crowd behind a character and once he hits the main show, fairweather fans will eat that shut and you'll still have the core fan base behind them. Worked for Owen's and Zayn. Not everyone pans out though.
I think Cole will transition easy because he already had a huge following. Same with Drew and Almas. The rest are trash.
That's the wrong approach to take though. They should be developing these guys to be successful on the main roster, not just carry over their Indy status and hope for the best. I think you're right about Adam Cole having success like Kevin Owens/Sami Zayn on the main roster. I could see Almas sliding into the Alberto Del Rio role that Vince keeps trying to fill. I could see Johnny Gargano having success on the main roster too. But the other guys have no appeal whatsoever & will be doomed for failure like Tyler Breeze, Tye Dillingers, Ascension and Apollo Crews.