Agree that detaching the Wiveliscombe John makes sense He appears to be an 'ancestor' of some Benetts that later went to the 'New World' I suspect he is speculative. .
The Wiveliscombe son John (Bennett-64) born in 1508 is supposed to be both a tanner and a ' the Earl of Tankerville' which seems highly improbable (There were Benetts became Earls of Tankerville but according to Wikipedia not until 1714 .There are parish records for Wiveliscombe from 1550s The death date on this profile (3 Dec 1564 )is the burial date for his wife Margery Free Reg The register entry, confirms that her husband John was a tanner. I can't find the death of John in Wiveliscombe but there are several candidates in the neighbouring parish of Milverton.
John Bennett of Clapcott was according to Cockayne married to an Anne Molines His 3rd son Thomas became Lord Mayor London.(some account of the Lord Mayors and Sheriffs of the City of London ) .https://archive.org/stream/someaccountoflor00coka#page/16/mode/2up )
The Victoria County History mentions John's death in 1547 but says his widow was an Agnes rather than an Anne http://www.british-history.ac.uk/vch/berks/vol3/pp546-549 The Molines (Moleyns)family also held the manor at a later date.
Molyns-1 is also married to a Thomas Freeman, haven't found anything to substantiate this marriage.
As to the wife with the strange name of Molinesum, there is no evidence of even the existence of the name.(not one hit for the word, let alone the name) There is already a note on her 'father's profile suggesting that he should be merged away.
Sounds like I'm volunteering, I am pre1500 qualified but I'm not that experienced in the aborist aspects so would like someone who is more experienced than I to give an opinion (help!)