Did you ever come to a point where your brain is telling you one thing and your heart is telling you something else and your instincts are trying to mediate between the two? That's what I am going through right now and believe it or not I really want to go with my instincts on this one.
I went to the library to use Ancestry to see if I could find any immigration/emigration information on George Walker (or Johann Georg Walcker). Believe it or not you can do the particular search I did for free and at home if you don't have a subscription. Anyway, I put Johann Georg Walker in the search boxes and clicked 'search'. Much to my surprise, the very first hit that came up was for a Johann Georg Walker that was born in SCHLAITDORF, Germany and his destination was OHIO. His application date was 1831, all which pretty much coincide with my George's obituary and I STILL think that Schlaitdorf was shortened to Slidor and its even entirely possible that whoever provided that piece of information for the obituary SPELLED it that way because maybe that's how its pronounced.
I honestly don't know but seeing not just the name but Ohio in the listing made me smile and told me (or at least my instincts) that the parents and siblings I'd found were the right ones. I also tracked Johann George's siblings in Germany and they ALL stayed there, George was the ONLY one to make the trip to America. Unfortunately, the Wuerttemberg Germany Emigration Index at Ancestry doesn't give any other information AND I couldn't find anything on a ship or when specifically in 1831 he arrived. But the word 'Ohio' was the biggest clue for me because that's where my George ended up.
What are my instincts telling me? They are saying that it is very possible that you may have found the key to George Walker's ancestry. I tracked the siblings to see if maybe one of their children went to America and possibly found George or something. With genealogy anything is possible. As for his wife Mary Ann Bertsche (or Bertseh or Pearce) I haven't found anything concrete yet, but the Bertsche family I DID find is the most likely candidate, at least that's what my genealogical instincts are telling me.