I think the confusion is about what "Gorey, Grimm, Scarry" mean. They, along with "Silverstein" in that game, are last names of children's authors.
And that would be OK as a clue if Silverstein was a red herring, Grizzly was also a children's author and Scarry sounded like scary (and also meant something in the same ballpark as Gory, Grim, and Grisly)
And that would be OK as a clue if Silverstein was a red herring, Grizzly was also a children's author and Scarry sounded like scary (and also meant something in the same ballpark as Gory, Grim, and Grisly)