It's just a hard mentality shift for some teams because it's so unusual. You can practice it all you want, but once the game starts and your basketball instincts kick in, you're standing under the basket and you think you're in good rebounding position because that's what a decade plus of playing organized basketball has taught you, but then you've got extremely athletic players like Solo and Payne, an extremely strong player like Coleman, and an athletic-but-also-crafty player like Garcia just attacking your body to move you from the spot or, what Solo does a lot, following the shot towards the basket which is an unusual angle for someone to be coming from.
I'd compare it to facing an option team in the middle of the schedule in football. It's just not something you're used to seeing, you can't really practice it because your players aren't going to be very good at it, and it only takes one guy not doing his job right for it to break down in the game.