I'm not going to let the other group perform
Why are you not going to let them perform?
I don't like them because they were perfect in every way.
Jealousy is normal, but acting on it like you are is very vindictive. You should be proud that they are performing very well, and you be supporting their efforts instead of being bitter and bringing them down.
Lol, no, they will fail soon enough.
If they fail, let them do so on their own. But if you try to interfere, then you are preventing them from doing it.