Hello . I came across a some reading material and media that mentions the famous Go Yoshihiro.   Im still a bit confused since there are no signed works of him that exists and his blades are incredibly rare due to him passing at such an early age.   So how do they attribute a blade to him without any signed works to compare to ??   And are there blades that sit in attribution limbo with him also being a very faithful reproducer of Masamune's work ?