Galvão surprised Adesanya with his new belt, asking the UFC champion to help him demonstrate a hold, before pulling the belt out of his Gi and awarding it to Adesanya.
"I've learned a lot here from Jiu-Jitsu," Adesanya said upon receiving it, addressing the group at Atos.
"Don't get me wrong, I've learned from every single person, but the main thing, and it sounds cliché when I say it, this guy," he said clutching Galvao's shoulder, "I never thought going to another gym, you'd see the same kind of family atmosphere we get back home.
"The catalyst is this man right here. Like he said, he's of the service industry. Apart from Jiu-Jitsu, I've learned so much, and being around him, he has an influence on everyone and [they're] just being a better person.
"I still don't feel like I deserve this, but I trust his judgement. A lot of you have told me I've gone up, and it's only been one month. I've got access to the online classes, and I'll make a promise - at least once a week I'm in the Gi. It's not going to be another five years before I put the Gi on."
Adesanya, Riddell and Ulberg flew out of the United States earlier this week and are set to undertake their two weeks of quarantine. Ulberg said the trio would get out of quarantine on Christmas day, so remained hopeful they would get to spend at least some of the day with their loved ones.