To accept the birth place for Mary Fry , one must prove that all of Robert's earlier born children were also born near "Yarte, Devonshire, England" or in England. For this to be true, one would have to remove the assumptive birthplace for Robert's in Leicestershire.
From a book's passage that I posted in Overview and awareness of the early history of Rhode Island and Newport, one may extrapolate a window for Robert's arrival, which may or require rethinking where when Robert married and where his children were born.
1622: First European settlement in what's now Warren, RI.
— None of the names of settlers include Robert Griffin.
Roger Williams established Providence Plantations in 1636.
— None of the names of settlers include Robert Griffin.
"In 1637, another group of Massachusetts dissenters settled on Aquidneck Island..."
— None of the names of settlers include Robert Griffin.
Newport was "founded in 1639 on Rhode Island, which is now called Aquidneck Island."
— None of its settlers was Robert Griffin,
No extant source proves that he first arrived elsewhere in Colonial America before moving to Newport.
He had been in Newport long enough to gain public respect to be named a Commissioner in 1656.
No respected source proves Robert's existence in Newport or Rhode Island from 1640–1655.
CONCLUSION: Robert probably came to Rhode Island already a married man with some or all children born elsewhere.