He is definitely a young prodigy and going to grow up to be a very good fighter. I think as long as he can keep focused and also stay away from drugs, it is going to be good for him and his career. He will also have a very good career if he can do that. But he definitely should not start being overconfident and cocky about it. He should know about what he can do and what he can not.
If I'm not mistaken, he has a amateur background, so I don't see that he could get himself into drugs since at a very young age he has been training a lot of already. And that is the worst part of it, if he go to drugs then it will ruin his career. And now that all eyes are on him because of what Floyd is doing for this teenager, for sure he will stay away from anything that will affect his future.
I have seen a lot of sane people taking and it's something that has happened when they were doing really good with their life. Sometimes it was bad influence. And sometimes it was them having some family troubles. This can also happen because you wanted to just taste it. And once you taste it, you are hooked.
What I am trying to say is he should not pick a fight that he cannot win. He should pick his fights carefully and wisely. After he is able to beat the opponent that is not the best, he can move on to beat the best, because that will prepare him to go up against those great fighters. Unless he just "Mike Tyson" this shit and just go after everyone.
That's not how boxing works, of course you always wanted to remain undefeated. But it is not a sign of a great and legendary career. Look at Manny Pacquiao and other greats before him, they have losses in their record and even if Floyd is 50-0, there are boxing pundits that put him behind Manny Pacquiao's career. But that is up for another debate though. Even the boxer you mentioned, Mike Tyson was upset by Buster Douglas.
Of course, I don't think to have a legendary career, you cannot be beaten even once. Mohammed Ali was the greatest boxer of all time for sure. He did not have a clean record as well. I believe Mike Tyson is right behind Mohammed Ali, and he also did not have a zero loss career. Floyd Mayweather might have no loss. But he is definitely not better than Muhammad Ali or Mike Tyson. But in this day and age, everyone wants perfection. It is definitely going to be better if he does not lose even once. But one thing he cannot do for sure is that lose in the early fights of his career.