According to Anderson, there is a "Viall, John: Unknown; 1639; Boston, Swansea..." listed in Anderson, Robert Charles. The Great Migration Directory: Immigrants to New England, 1620-1640. Boston, MA: New England Historic Genealogical Society, 2015. Page 350.
So, John Viall-97 should likely be PGM. I'm sure we will hear from Jillaine, Anne B, or someone soon.