Grindelwald's role is golden. In the original work, the young Grindelwald appeared, giving people a dazzling feeling from head to toe. "Golden Bird" is the official adjective of Grindelwald. What does gold stand for in HP settings? -Lion House standard color!
If Grindelwald is Slytherin, should it be set to silver? With a gloomy temperament, like tom riddle?
As the Dark Lord, Gerlind Wo is sunny, dazzling and talented. No wonder Dumbledore dazzled him. Deer and dogs belong to Gryffindor, and the golden bird is the symbol of the Order of the Phoenix. The symbols of Fox and Phoenix are red+gold = Gryffindor.
Look at Dumbledore's hair when he was young. That's auburn, which is Celtic ginger hair. Lily Evans with red hair and the Weasleys are Gryffindor. Grindelwald's hair color is pure gold, and his and Dumbledore's colors are just the standard colors of Gryffindor. Dumbledore's patron saint is the phoenix (golden red bird), and the Grindelwald people are born with a pair of lions.
Grindelwald's personality is also very young. Grindelwald's personality is laughter, Fred George and practical jokes. If such a lively and cheerful person is not in Gryffindor, he can only be Peeves. Tom riddle, as a representative of Slytherin, is always inseparable from the description of snakes and the gloomy and hissing voice.
Slytherin College is an egoist, and there are few gentlemen here. If Grindelwald belonged to Slytherin, he wouldn't have made such a "stupid thing" as a fair duel. More importantly, he can defeat the enemy without fighting. As long as he writes a letter to Dumbledore, saying that Arianna was killed by Dumbledore and that he was a witness, or threatening to expose the privacy of Dumbledore's early collusion with himself, Grindelwald will win immediately without a bloody knife.
It is Slytherin's spirit to get the maximum benefit at the least cost, and Grindelwald can't fight at all. Doesn't he know that a duel will lose both sides or kill one thousand and lose eight hundred? Which way is more cost-effective? He chose the most uneconomical one-on-one
There was every chance to hit the enemy at zero cost, but Grindelwald didn't do it. And this chivalry or chivalry is Gryffindor's most precious character.