It's people like this, who have the dream and the drive, that keep the sport alive and going. It's those that don't make it on a pro card that have if anything more zeal/zest for this sport then anyone, cause they never give up and die trying!
Genetics are just a road block in the mind that will mind fuck us in this sport, look above and beyond and push it to what ever fricken limit one wants, be more then what you are today, and be ever better tomorrow.
We need all types of people in vast areas in this sport to help all of us everywhere. I bet this guy you speak of Nuk, has forgot more then what most people will know in a lifetime with this sport!
This sport is about support and bother-hood, let the "judges do the judging", other wise let your friend dream and keep chasing his dream, for all you know, it may be the last and only dream he has left!
I know for one thing, this sport has saved more lives then it has taken lives. Kudos to your buddy Nuk, and very cool of you to show that much compassion and heart to your buddy, sounds like you truly care for your brother there.
If anything be his biggest critic to get better and better.
Good luck.