Probably a bit late to respond to this one, but I am descended from George Morgan and Margaret whom you identify as Marguerita Theodosia Ingram - if that is the case it explains the Ingram connection in their descendants. If you or anyone else is still exploring this would like to hear.
I owe this tree of Derek Williams, so I'm not giving you all my own work here. George had a daughter Margaretta Theodosia (1791-1874) whom you refer to as Mary Ann Morgan. She married Thomas Jarman in 1813, and their son John was grandfather of my mother's mother through his daughter Annie Jarman who married Charles Edwards formerly of Newhouse.