Não, isso é apenas uma coincidência.
É assim que ele descreveu :
Well… In 1981 I wrote a novel with Lisa Tuttle called Windhaven. In fact, we wrote three different short stories with the same main character, Maris, and once we had them written we decided to put them all into one book with three different parts. So while we were writing the books we thought about a dwarf who would have been the Lord of one of the islands. He had to be the ugliest person in the world but the most intelligent too. I kept that idea in my mind and it reappeared to me when I was starting to write Game of Thrones. So…That’s Tyrion Lannister.
Então, como você pode ver, o Cat's Cradle não é uma inspiração para Tyrion, porque do contrário George teria dito isso.