I believe, according to the evidence reported in Kerry Ross Boren's book, The Boren Family: An Irish Legacy, that this is the correct husband for Sarah Alley. The other John Boren [Boren-393] that some genealogists think was married to Sarah Alley was this John Boren's uncle.
Mentioned in John Boren's will are firstly; the heirs of Bassel (Bazel) Boren; the heirs of Susannah McIntosh, (Israel's widow); the heirs of Horace (Hosea) Boren; and the [potential] heirs of J[ames] Boren. Mentioned secondly are son James F Boren, (underage); son Francis M Boren and daughter Eliza Massie (Boren).. Lastly mentioned are Casandra (Horace's daughter), and Sealy Boren, (?). His wife Sarah was already deceased earlier in the year. His son Willis is not mentioned. The will was dated November 1833 and probated February 1834 in Madison Co., Tennessee. There is NO mention of a Tarleton Boren or his heirs.
* Boren, Kerry Ross & Lisa Lee. The Boren Family: An Irish Legacy. K&L Boren Partnership. Salt Lake City, UT, 2010, pp 138, 173. 176-177.
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with John: