Plus, he has no embarrassment, hesitation, or fear of failure.
This is key. I spent a period one summer in a Welsh immersion course. There were some very well-educated, clever Americans there (I would like to think I was one) and people from more polylingual parts of the world often with less explicit linguistic training. The latter tended to do much better chiefly because they set aside ego and tried to do what they were there to do: learn Welsh. The Americans were afraid to make mistakes and sound like idiots, so they didn't take the risk and consequently achieved less proficiency. The best learners were an Englishman (with a PhD in physics) who had shed his pride through thirty or forty years of vagrancy, and a Breton, who was just gifted with humility.
Telling them that I'm Finnish worked well enough, until I was introduced to a Finn. That was one of the more awkward moments of my life!
This is important. As adults who are likely experts in something, it can be very hard to put our egos aside and know nothing again.