Kitty, I agree that is looks like we are not connected.
The Pletz family that I know about is from down state Illinois.
My father was born around St Louis, and worked for Brown Shoe Company My grandfather was from the St Louis area and also worked for Brown Shoe Company My great grandfather was a cobbler in Lincoln, Illinois. My grandfather's brother worked for Converse Shoe Company.
As far as I know, we do not have any direct connection to the Pletz's that you talked about. Good luck in your hunt.