You have no idea how happy I am that you have contributed information about the parents of Louisa McCoy. I had just about given up hope of ever tracking them down.
I am a descendant of Ezekiel and Louisa through their son Marcus D. Lafayette Spriggs. They had quite a large family and there are many descendants. I have tried to put a register together on my tree "Polly Henrikson" at Ancestry.com if you have access. If not, I will be happy to share all that I have on the Spriggs family.
I would, of course, love to see the inheritance information you have referred to. Did you know that there is a reference to that inheritance case which comes from the 1825 Roane County Chancery Court records? Ezekiel Sprriggs is mentioned by name, but not his McCoy father-in-law. The excerpt I saw mentioned that old MCoy died while one of his inheritors was still a minor and indicates this delayed the probate.
Ezekiel Spriggs was an early settler in the Eastern TN area once considered to be part of the Indian Nation until the Hiwassee Treaty was signed. He was born in the Saluda Valley area in Greenville, SC, and named for his maternal grandfather, Ezekiel Potts (per Ken Spriggs). He was a large land owner in the Cleveland, Ooltewah and Long Savannah area and he was a prosperous farmer. As of a few years ago, at least one portion of his original land was still being farmed. The original farmstead was in good shape, but the Spriggs Cemetary was neglected. I have heard you need permission from the owners to look around.
Ezekiel's children were well-educated, including the girls. I came across a biography written about daughter Louisa Parks which praises her refinement and education. She was named for her McCoy mother, and married into a part-Cherokee family. Her husband, George Washington Parks, moved the family to OK and became a Supreme Court Judge in the Cherokee Nation. Her brother John also married into a part Cherokee family.
Offspring of Ezekiel an Louisa were: Caroline Spriggs 1819–1878, Adaline Spriggs 1821–1880, Shiloma Spriggs 1823–, Louisa M. Spriggs 1826–1893, John M Spriggs 1827–1900, Theodocia Spriggs 1830–1920, Marcus D Lafayette Spriggs 1832–1899, Caledonia Spriggs 1834–1910 and Ezekiel B Spriggs 1841–1919.