Dredgen Yor's gun was always thorn. It slowly corrupted him and it wasn't until he was completely corrupted that he saw the gun as it really was. Jaren ward was in no way related to Dredgen Yor either.
English
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It started out as a Rose, and then it got corrupted alongside him into Thorn, a Weapon of Sorrow
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Ehh i interpreted it different then you i guess.
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But we don't know the history of the first curse it's possible he abandon the curse for the rose ( thorn)
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Anythings a possibility but its highly unlikely.