Looking again at IGI baptisms, a John and Rebecca WRAY continued having children at Burton on Stather until 1819. As Burton is just a few miles from Barton upon Humber, it seems more likely that this was the couple who married at Barton and that that particular John and Rebecca WRAY did not move to Market Deeping.
This now of course throws into doubt the parentage of John WRAY, as the one born in Burton upon Stather seems less likely.

I suspect Rebecca CRAFT (wid) had been Rebecca MARR who had married John CRAFT at
Trusthorpe 9 April 1806 (one child, John, July 1806)
in which case, there is this possibilty,
Baptised 19 Feb 1775 at
TrusthorpeJno WRAY, son of Jno and Elianor
The only Rebecca MARR I can find was bap 1791 which makes her a bit young for marriage in 1806, but you never know
