Hi Rob Ton,
Being a Puritan is not a qualifying characteristic for profiles in the Puritan Great Migration Project. From the project page (emphasis added),
"New England colonists who started arriving after the Mayflower and form the 20-40k settlers who arrived as part of the "Great Migration" generally associated with the Puritans between 1621 and 1640 (some say 1650). It includes both Puritans and non-Puritans, with the exception of those who came over in 1620 on the Mayflower, which has its own project."
Of his migration, you wrote, "it seems more likely to have been 1640-1650." I would add, in any event, prior to the close of 1650. While I have not fully parsed the information, an 1873 article, "Early Settlers of Stratford, Conn." (NEHGR 27:62-63) includes Burritt's name in an undated list of those who settled early at that place. Quoting from the article's description of the list (emphasis added), "The following large list was taken from the town records, and probably was made before 1650, as William Burritt died that year."
You may want Jillaine to confirm, but this sounds like an interesting documentary case that should be included in the PGM project. --GeneJ
P.S. I have not seen Ellwood Count Curtis' The descendants of William Burritt (c. 1610-1651) and his wife Elizabeth (c. 1615-1681), published 2001.