According to my dad, Odus Marchal, their was major family discontent (don't know the exact reason) in the Marchal or Marshal families. Thus the spelling difference in the names.
The reason, again according to my dad, as Addie was his half aunt (but still considered them aunts), for going to Idaho as it was praised as the next Darke County, Ohio.
See Darke County Ohio,where Versailles, Frenchtown, Osgood, among other towns there, has some of the richest farming soil around.
Plus Addie Marchal Barga's first cousin, Joseph Philip Marshal (notice the different spelling of Marshal)was already in the Twin Falls area. He was known as the Potato King. Joseph was already in the Idaho at the turn of the century or 1902.
Delroy and Addie must have went to Idaho right before your dad's birth, as 6 children were born in Darke County, Ohio. So give or take 1925.
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We spelled our name as Marchal, as so many of the Darke County Ohioians did.