Okay, here's my contribution toward sorting out what's what with this family, and what should be done.
First of all, the legendary sea captain story that appears in the Knowlton genealogy is buttressed (if we may use that word by the following quote from page 20: "Captain William was at least part owner of the ship in which he sailed for America. He died on the voyage, probably not far from Nova Scotia, for a land surveyor, Alphonso Wells by name, in the employ of the Canadian government, brought word to the Canadian Knowltons that, when surveying land in Shelburne in 1839, he had found an ancient head-stone there bearing the name of William Knowlton, 1632.... Tradition also says that his ship was sold here, and that his widow and children proceeded to Massachusetts, probably to Hingham, the following year, where his widow is said to have remarried." See https://archive.org/stream/historygenealogy01stoc#page/n101/mode/2up
I would like to suggest that we retain the legendary William Knowlton-84 as the "uncertain" father of brothers William, Thomas, and John Knowlton of Ipswich, including a notation that there is no reason to take the "sea captain" story seriously. It seems to be well-established that the three Knowlton brothers of Ipswich were indeed brothers, per Ashbel Woodward, "Memoir of Col. Thomas Knowlton, with a Genealogy of the Knowlton Family," NEHGR vol. 15, p. 344.
I'd like to suggest that the legendary Captain William, properly identified as legendary, is a suitable placeholder to tie together the three real Knowlton brothers on WikiTree. I'd also like to suggest that Capt. William's wife and parents be detached, with the customary "disputed" notations in Capt. William's profile.
Now, regarding the Nolton/Norton family of Hingham, the death of William "Norton" is recorded in the Rev. Peter Hobart's journal, published in NEHGR, 121:11 (1967). Of course we don't know if the original said "Norton" or Nolton." But Anderson goes with Nolton, and of course Anderson is our guiding light on such matters. This means that a new profile for William Nolton should to be created, with a paragraph differentiating him from the legendary Captain William, and showing the alternate spelling of "Norton."
This is because the History Hingham conflates William "Norton" (freeman in Hingham 1636) with William Knowlton of Ipswich (d. 1694); see https://archive.org/stream/historyoftownofh0203hing#page/92/mode/2up
Regarding Anderson's "slip of the pen" regarding Susanna and Paul Guilford, there seems to be no documentary evidence showing that they were children of John Gilford who died at Hingham in 1660, as recorded in Rev. Peter Hoart's journal published in NEHGR, vol. 121 (1967). The baptisms of Susanna and Paul appear in Rev. Hobart's journal, but without mentioning the parents. So it seems that John Guilford should be marked as the "uncertain" father of Paul and Susanna.
On 21 Dec. 1681 Paul Guilford and wife Susanna of Hingham sold three acres of land to John Chubbuck, the land being part of his house lot, "which had been given by the inhabitants of the said town of Hingham to William Nolton his grandfather." Per Suffolk County Deeds, vol. 13, p. 258 at http://https://familysearch.org/pal:/MM9.3.1/TH-1961-36088-12190-45?cc=2106411&wc=MCBL-16D:361613401,361839601