We have a team of 6 but one left once they made audio and then we brought an artist in. How does that work if 7 people contributed in total? I understand we can't get 7 courses and if it disqualifies us from any courses, that's fine but we'd still like to submit our work

Technically it's just as if the person who left is the owner of a free asset you found in that case so I don't think it will get you disqualified or anything.

It's probably a good idea to ask in the Discord, or to e-mail them just to double check.