(1) The problem of who married Mary Hinckley (b. 1631, Tenterden, Kent, England) of Barnstable, Mass., daughter of Samuel Hinckley, has not been solved. Since doubt has been cast on previous suggestions over the years concerning who she married, I am here and now proposing that she may have very well been the Mary who married Daniel Stewart of Barnstable (and later of Edgartown).
(2) Daniel Stewart died at Edgartown, Martha's Vineyard, Mass., in 1703, his will of 06 January 1701/02 being probated on 04 August 1703, with Benjamin Smith named as executor. Benjamin Smith was also originally from Barnstable, and his mother was Susannah (Hinckley) Smith, sister of Mary Hinckley.
(3) Therefore, it is very possible that John Stewart had married Mary Hinckley (Susannah's sister) at Barnstable. That would make Benjamin Smith (the executor) their nephew. It is also interesting to note that Benjamin Smith had a sister named Dorcas (as well as a daughter), which could explain why Daniel and Mary also named a daughter Dorcas.
(4) Daniel Stewart ( https://www.wikitree.com/wiki/Stewart-373
) is currently shown as marrying a Mary Vincent, but I have found no supporting evidence. It seems likely that someone confused this Daniel with his grandson Daniel (Stewart-16788) who did marry a Vincent.