If you read the lore, the rose we used as a legendary was the original rose. Also Shin Malphur says there wasn’t anything innately special about the rose, just the guardian using it. We took the original thorn, purified it to the original rose, and further imbued it with light to make something completely our own: The Lumina.
English
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"Stories tell of 3 glorious Guardians with powerful weapons tithed to their legend: Dredgen Yor, a man of Darkness with a revolver of jagged agony, the Thorn. A weapon of Sorrow with a purpose of murder and bloodshed. Shin Malphur, a renegade, the man with the golden gun. His weapon, The Last Word. Dredgen Yor's last word. Not Shin's. And finally, The Chosen. A Guardian of purest light, they wield such an immense concentration of light that the jagged husk of the Thorn was shed and reverted back to a cleaner form. With this clean form, the Chosen took the weapon and imbued it with the light of hope. Their weapon stood as a beacon. The Lumina." I can imagine some lore guy prescribing these handcannons like this.