I realize this is along the lines of a buyback product, but I wanted to ask for clarity before I add a checklist. In 2013 Leaf released Leaf Metal Draft baseball and then in 2015 they sold Retro Proof cards based on the 2013 set through their eBay store. The difference being that instead of being autographed there is a "Retro Proof" stamp and are hand numbered and encased, similar to Topps' Vault program.
I am confused if this should be added as a parallel to the 2013 Leaf Metal Draft baseball set (same checklist), should this be considered an insert in the 2015 Leaf Metal Draft set or should this be listed as a completly seperate 2015 Leaf Metal Draft Retro Proof set? There are also parallels which would also be included in which ever set this ends up listed with; the base Retro Proof, blue, green, red and super and the serial numbering seems to be arbitrary and not based on the color.
COMC has them listed as, which adds to the confusion:
2013 Leaf Metal Draft - [Base] - 2015 Rookie Retro Retro Proof