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I'd like to share some thoughts regarding the clue about Ara's murderer. It seems that deliberately, the most contradictory interests were gathered: for example, Armstrong created the best hits in the 1920s, while Avril sings, voices characters, and acts in movies in the 21st century. Hockey is a winter sport, believed to have originated in the Middle Ages, while basketball is a summer sport and relatively new (late 19th century).
So, I wouldn't look for Armstrong or hockey in the profiles, but rather for some contradictions of this kind.