I think it would be better if the hunters participating in the contest only shared the pizzas they made instead of having detailed discussions here. If any discussion is needed, it might be nicer to continue it in a separate thread.
I don't think that is necessary, because this is not the first time this contest is been run on this forum, and if they were able to run the previous successfully by allowing both discussions and submission of contest, I don't see any reason why this is not be successful too. Because at least by combining everything, it makes the thread uniform. So I don't think there is any issue with O.P's decision to make everything be posted here.
tokentikas idea is also not a bad one if I’m to be asked and his own idea is basically just to bring orderliness into the thread. In the sense that the whenever you are clicking on the thread, you are doing it just for the purpose of posting your own contest or reviewing what others have posted and not with the intention of making any discussion here which can be easily achieved just by the op creating a new thread and linking it with this one through editing the post with the discussion link below it. However what you are saying is also not out of place as you are looking at the op continuing what is traditional with his contest here which means posting both the contest and the discussions here. If I was in the position to choose, I will prefer the position of Tokentikas