None of them were meant to make it to Osaka Tower (A True MARVEL!).
Remember all those cameras Staple said had been set up all over Ravenwood Mental Facility? The ones that were supposed to catch everything the inmates did if they tried any funny business? Well, they worked, capturing footage of Dunn breaking down his steel door and The Beast climbing all over walls and ripping out people's throats. That's why Mr. Glass wanted to be taken through the basement at the end: So that he and everyone else would be seen.
Mr. Glass, a true mastermind, knew that neither he nor Kevin nor Dunn were getting out of Ravenwood alive, and so he set up a scenario where all three of them could reveal their abilities to their fullest extent for all the world to see. But, you ask, wasn't all the camera footage deleted? Not before Glass had it all sent to a secret account, which turned out to be a ghost address that forwarded everything the cameras recorded to Dunn's son Joseph, Kevin's one ally Casey Cooke, and Glass's mother, who then enabled the footage to go viral online and on TV.
The tower tease, possibly Shyamalan's boldest red herring in the era of explosive CGI light show superhero showdowns, was never the point. His superheroes were going to have their showdown in the middle of a parking lot, far from the city lights, with no one watching them except for three true believers. All that mattered to Glass was that, one day, other people with other supernatural abilities would see that they're not the only ones, singlehandedly foiling Staple's organization's attempt to prove that the extraordinary doesn't exist.