Rule (5) is insensitive to whether shared properties in the positive analogy are projectible in Goodman's sense — it treats 'grue'-like structural similarities as equivalent to causally grounded ones.

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Causal: # Causal Causal means something directly causes or brings about something else—like how striking a match causes it to light. When we say there's a causal relationship between two things, we mean one actually makes the other happen, rather than just happening at the same time by coincidence. It's about real cause-and-effect connections in the world around us.
Nelson Goodman(the philosopher whose theory is being discussed): A 20th-century American philosopher who developed theories about how symbols (like words, pictures, and artworks) work and mean things.
Structural similarities(as contrasted with causally grounded connections): When two things have the same pattern or organization, even if there's no real cause-and-effect connection between them. For example, two objects might look the same without one causing the other.
grue(Goodman's new riddle of induction; used to illustrate non-projectible or gerrymandered predicates): A predicate true of an object if it is green and examined before 2020, or otherwise blue.

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