A sincere thanks for your efforts in piecing that all together! Based on what you found on top of excellent assistance by Zlatica, Tadeusz, and Arek (as well as my own amateur research efforts) I would say 95% of that description sounds right on the money.
I'm inclined to believe Leo was born in and/or emigrated from Pogozela, Poland, and his father Tomasz Janicki was from Russia or was an ethnic Russian in Poland, hence Leo's Russian-Polish connection.Leo's daughter Margaret Janicki was my wife's late grandmother and her late great aunt was Dorothy Janicki.
The jury's still out on whether "Grechowo" is in fact Grekovo, Ukraine, or Grechow, Poland (or somewhere else).But that's not really so important anymore since the Pogozele link seems to be iron-clad.
I'm also not sure if the man from GREFOFA is the same Leo Janicki from my wife's family.I'll explore later.