I fear that you have your Robert Poages mixed up a bit.I don't know any genalogical history about the Renick family.
However, I do know that Robert Poage of Augusta Co who immigrated from Northern Ireland, first to PA, then very quickly to Augusta Co., VA (at least by 1740), was married to Elizabeth Preston, sister of John Preston the immigrant who married Elizabeth PATTON, sister of James Patton.
Robert's marriage to Elizabeth Preston, before they came to America (the 8 oldest of their 9 children were born while they were still in N. Ireland), is documented thoroughly in each of the many books written on the separate family lines connectd to the Robert Poage of Augusta Co, VA family. Robert had ayounger brother, John Poage of Rockbridge Co, who arrived in Rockbridge Co, VA by 1739.
There are many, many books written on the Poage/Pogue lines documenting Robert's marriage to Elizabeth Preston, as well as in books on related family lines, such as thePreston, Patton, Breckenridge/Breckinridge, Woods, Hopkins, et al families.
There were definitely "other" Robert Poages (or Robert Polks, or Robert Pollock, which derives from the same original family back in Scotland and to some extent in N. Ireland).Note that spelling cannot always be relied on in the earliest American histories/genealogies, because often members of the same family spelled their name differently, once the sons or daughters settled on their own farther west, once when others in the area they settled had difficulty with a particular spelling, or in the case of my ancestor who changed the spelling of the Poage family name for the next 7 generations because a judge in land court had misspelled his favorable verdict and my ancestor did not want to correct the record over spelling, fearing that he might open up further opportunities for others to litigate - he accepted the judge's spelling and just changed how he spelled his own name! There were even several branches of Robert Poages who settled in PA and then went west (e.g., to Erie Co., PA, without ever settling in VA).
Of course there were also the Robert Bruce Pollock/Poage/Polk family (uncle ?? of Robert Poage of Augusta Co, VA) who settled in the late 1600's on the Eastern Shore of MD, many later going further south to NC, etc. , and from whom President James K. Polk descends.