Good point. And speaking to the broader point, I think the chance of those three being the magic three is approximately nil. Slightly more likely than nil are the three current masters of the Deathly Hallows: Harry (Cloak), Dumbledore (Elder Wand), Quirrell (Resurrection Stone, though perhaps not master). Master of the Elder wand is very important in canon, and Master of the Cloak is important in this story.
The reason both Fred and George can be the Heir to Gryffindor is because they’re magically the same person, though...
Good point. And speaking to the broader point, I think the chance of those three being the magic three is approximately nil. Slightly more likely than nil are the three current masters of the Deathly Hallows: Harry (Cloak), Dumbledore (Elder Wand), Quirrell (Resurrection Stone, though perhaps not master). Master of the Elder wand is very important in canon, and Master of the Cloak is important in this story.