It would have to cycle around. Let me explain:
This week, you can create ANY replay you want, ANY settings too. All you gotta do is not make it much longer than 500. Then I will choose the winning replay next week as well as an opener that I like from anyone else (not necessarily the winner's opener).
Then the challenge after that will use that opener. When that week ends, you create ANY replay again and we repeat the process. So you guys still get the challenge of working with someone else's opener but also get to experiment on your own replay once in a while. It's a good balance I think.