Sets and products
Each release, built from the cards we can actually corroborate inside it. Nothing here is a stub for a product we hold no cards for — a set earns its page from its contents.
No release has 6 corroborated cards yet. Cards become corroborated as independent sellers list the same card or a sale is recorded. Set pages appear on their own as that happens — there is no list of releases to maintain by hand, which is what keeps this working for next year's products as well as this year's.
What each parallel inside a release is worth is covered on the parallels hub, and how products relate to one another in why there is no such thing as the base card.