well i think its more like the component doesn't NEED to know how to summon their individual weapon to contribute to the fusion

like if sapphire learned to summon her weapon on her own, garnet's gauntlets don't change, the knuckle studs just become sapphire's individual weapon without ruby

another dumb but possible idea i have: the cutlass is actually aquamarine's weapon, but she only knows how to summon it while fused due to ruby's fighting prowice, that's why its only blue

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