1. You are taking part in a regular competition. How can it be dangerous to register through formal channels and be officially recognized?
There was no cheating in the middle of the game, and the result was good. Of course it won't be a problem.
It is not uncommon for college students to compete with each other. I haven't heard of anyone being disqualified because of the previous name. As long as the players actively and seriously participate in the competition, the results of the competition will also be enjoyed by the whole team.
As long as you are in the competition team, you are on the submitted registration list, even if you just name it, there is no danger. You can rest assured.
In short, as long as you participate in the team of college students' competition and your team wins the prize, you have the right to share.