Good Morning Shelley,
Its very nice to hear from you. I'm sorry to say no I've been stuck too for some time too. (13 years) I have some ideas but I haven't been able to get my pieces to match up. I don't want to lead you down the wrong path. If it make you feel any better everyone is stuck.
According to the 1810 census there is a George Manley lives very close to a Richard Davenport. I believe he is our grandfather or uncle. I do know Elizabeth was born in Connecticut and a large number of families that moved into the area were from Connecticut.
I know the Manley's moved to Smithville in 1797 from Coventry CT. There are records for Richard Davenport in Coventry CT but the information I have found conflicts with this possibility so I don't know.
Which child of George and Elizabeth are you related to, Their daughter Lucy is my GGGG Grandmother.
Any questions on the Manley side? That side of the family I know backwards and forwards.
Hope to hear from you soon,