Yes, I can't get the endings right, but I've already half understood how it works.
The thing is that I gave height to 4 of them plus the one I wanted to get at the end and I had some height. But the biggest one was the one I wanted at the end.
But even so there was more than 1 character taller than 2000 cm; I guess that's why it doesn't work.
Thank you for clarifying this doubt.