Yes, it's good to summarize the findings like this. I see you've started a new thread, which is excellent. I'll stay out of it, hoping that will encourage other researchers to step in.
Words of caution:
1) You say Mary's maiden name is Sanderlin (or a similar surname). We have no proof of that, only clues that it MIGHT have been.
2) You give William and Mary a birthplace. So far as I know we have no documentation that William Lowe was born in Ohio and that Mary was born in Virginia.
Someone said William and Mary were married in Jefferson County, Ohio. So seemingly someone (was it Marion?) has their marriage record. Their marriage or death records or obits may tell their place of birth and/or parents' names.
Marion (a descendant of John C F Lowe) posted a lot of interesting information on this family. In one of many posts, she wrote, "Only information on his brother David is this. He was called Uncle Scythe by his family. He disappeared during the Civil War."
Below again is that 1850 census, and I'm adding info from Marion's Ancestry post (not verified by me):
1850 Mount Pleasant, Green, Wisconsin William Lowe 45 b about 1805 Virginia Mary Lowe 43 b about 1807 Virginia Benjamin Lowe 18 Joseph P Lowe 16 - David Lowe 14 b abt 1836 Ohio - m Hannah Hutchins, m Mareda Squires (m Canfield) Sarah Lowe 12 - married John or Jacob Rumford William H Lowe 10 John C F Lowe 7 - married Mary Elizabeth Canfield Cyrus Lowe 5 Mary E Lowe 1- "Elizabeth"? married Daniel Stuart Lewis?
Sarah Lowe (Rumford) and John C F Lowe BOTH ended up living in California, per Marion. I haven't looked for documentation, just reporting Marion's words.
More from Marion's post on Ancestry.com:
John Chambers F Lowe first married Mary Elizabeth Canfield (18 Sep 1864 in Patch Grove, Grant, WI) and had CHILDREN: William Henry Lowe b 23 Dec 1865 Boscobel, Grant, WI m Edith Eva Horn Rosa Bella Lowe b. 21 April 1870 m. Daniel Rhodes Agnes Pearl Lowe b 16 Feb 1877 and d about age 11 in 1888
John C F Lowe next married Martha Elizabeth Madison and had CHILDREN: Minnie Mae Lowe b 1881 m Albert Miller John Chambers Lowe, Jr. b 1883 Amer Lowe b 1886 Ade Lowe b 1890 Viola Cecelia Lowe b 1892 m Louis Joseph Graton
According Marion, her family lore says John C F Lowe was b Dec 1839 in Dayton, Tippecanoe, Indiana. John died 1915.
In one of her posts, Marion seems to say that John C F Lowe kept diaries. She also says that "in family writing" John C F Lowe mentioned family members and Marion posts Joseph P., Sarah, David, and Elizabeth as siblings.
1900 census in California says John C F Lowe born Dec 1842 in Indiana, father b Indiana, mother b New Jersey.