Here's how I am doing this: the top eight competitors without invites already will get into the tournament of champions. However, since two previous invitees (Dendro and Mudkip) are already in, if one or both of them win their rounds, then the one (or two) highest-scored defeated chefs get those 7th and/or 8th invites.
So, twelve competitors, by this tournament's end, will be invited to the ToC from both "Age of..." tournies. I also will be doing a grinder for four last spots. More info on that by this tournament's end.