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PCI agree 100%. Magie and Doyle Nat'l were created as such, as were the rarer team variations. These should be checklisted (as they currently are), and are needed to consider the T206 set complete.
Cards with stray marks, missing letters, etc. are in the same category with those with missing ink -- they can be considered variations (or errors, or defects), but there is no reason to consider needing them to complete a set.