First off Ed Hans is one of the very good guys in the hobby.
Honestly, I don't know if I have any information to contribute regarding T205 backs. I guess I could pull out the set and write down each back front combo. I have enjoyed learning the current findings spreadsheet, but it won't really change my buying habits.
I am more of a front guy and want to concentrate on the SGC Registry. I have had my share of blank backs - raw and graded, Hindu's and Drums etc... It was cool to own them for awhile but it never really got me going.
I like to think I am smart enough to pick out a Piedmont 42 from a stack of raw cards and buy it. However I prefer to concentrate on the variations, short prints and the hard to find cards.
Feel free to reference my website to see how I categorize T205's.
http://www.imageevent.com/babybingbaseball
When you are on the T205 page be sure to click at the top and look for these:
"Short Prints"
"Minor Leaguers"
"Variations"
"Tough to Find"