Leon - My guess is that its the least pop and a portrait, so it checks all collector the boxes from player, type, scarcity characteristics. That said, I think the bat off shoulder aesthetically is his best card in the set.
Dmitry - Here is a good pop article on the T206 Cobb versions, there is more greens than people think...
https://prewarcards.com/2017/09/29/t...ckett-grading/
Ryan - Good comparison on the Ruth's. The (yellow) #53 is similar to the green cobb, but I personally like the one below better, I guess its the "bat off shoulder" version...but his bat is on his shoulder...