Your information on the CONNER/WILMETH connection seems to agree with mine.You mention the 1870 Census as having Joseph and Mary WILMETH and I.J. & Rhoda RHODE WILMETH as being nieghbors of your CONNER kin.Mary and Joseph are the parents of I. (Isaac) J.
There is another Conner connection which could relate to your family.Cynthia Ann WILMETH m. Ezra CONNER on 19 Mar 1854 in Henry Co, IA at the home of her parents, Joseph and Mary WILMETH.
My branch of the WILMETH family moved to Henry Co, IA from Union Co. OH.I do have a PARKER branch that moved from Athen Co. OH to Henry Co. IA.Thomas PARKER m. Nancy Virginia WILMETH in Henry Co.They did go to Scotland Co. MO, then on to Caldwell Co. MO.I do have more info on these related families if you can use it.