There not enough information on dragon culture to really get a definite answer
But it seems that dragons live in a dominant type society living and traveling in groups or most others just live in isolation alone. My guess is that either the the bigger dragons are somewhat passive to small young leaders to see how they grow and if they’re fit to actually lead them. If that’s not the case they will most likely not listen and leave on their own accord. It’s not like dragons do much outside of sleeping and getting stuff to either hoard, fight, blow up.