"But some of us can already walk on crystalized lands," Aang said. "Does that mean the group... groups that Kalki summoned don't have a piece of the Calamity in them? Or that we have them under control?"

He held out his own clear crystal as a demonstration.

Aang would be good with not having another journey into his own mind to fix things. He's done that a lot for someone who hasn't finished growing up yet. And he could focus his energy on helping others.