Regarding your James Sweet. see:
The American Genealogist, vol. 53 (1977): 28-30. James Sweet of Rhode Island: A new Mystery, by Lois Stewart.
whose conclusions were challenged in
The American Genealogist, vol. 67 (July 1992): 177-183. James Sweet of Warwick R.I., by Harold F. Porter. (Lots of wills and original records to prove confusing relationships.)