In support of your theory Dan, and in accordance with the obituary of William Henry Argue (Luaine's ancestor), William Henry and his brother Henry emigrated to Canada in 1837. Therefore, believe the following Henry Argue could be eliminated, as his headstone states that he emigrated in 1832 from Cavan, Ireland and he would have been born c1807.His burial information is as follows: Cedarvale Cemetery, Saginaw (near Cannington, Ontario): Henry Argue, emigrated from County Cavan, Ireland 1832, died Sept. 8, 1883, aged 76 yrs. Phoebe Argue, emigrated from County Monaghan, Ireland 1832, died Dec. 4, 1872 aged 69 years. Also: In memory of Richard Argue, d. April 5, 1910, aged 75 yrs., 10 mos.His wife Clarinda Long, d. Jan. 9, 1915, aged 72 yrs.Gone Home.
There is also another Henry Argue (born c1801) who married Margaret Wilson at St. John's Anglican Church, Cavan Township, Ontario 16 Jan, 1826.She was from Port Hope, Ontario.The family resided in Millbrook, Cavan Township, Ontario. (Family notes from Don Robertson, do not show the mention of a son Thomas).
I'm not aware at this time, of any other Henry Argue's that might fit.
Have you checked with Luaine at all as to whether any family documents mention anything further? All the best, Debbie