I think we need to stop worrying about “greatest value as a SS.” Marte’s greatest value to the Reds will be to add another young offensive cog to the horses coming up from the minor leagues. Even if Marte ends up in LF, his bat will be a huge addition for several years.
At the end of the day, if EDLC gets moved to 3B and Marte ends up in the OF, it’s all good. And if the Reds tell Marte that his quickest route to the major leagues is by way of RF or LF, I guarantee that he’ll be shagging fly balls in the OF during batting practice tonight.