I think the answer to the original question, as illustrated by these profiles is that in general a merge should not be completed until there is sufficient information to say two profiles are for the same person - and in this specific case I would say that the two profiles are for separate people whose details have been conflated... (apologies for some duplication from previous comments)
Person 1. Sarah (of Newbury), daughter of John
[Pike,] Sarah, d. John, Sept. 13, 1655
Source: Vital records of Newbury Massachusetts to the end of the year 1849, vol. 1., Births, (Salem: Essex Institute, 1911), 405; digital image, Internet Archive (https://archive.org/stream/vitalrecordsofne22newb#page/n643/mode/2up); imaged from Allen County Public Library, Fort Wayne, Indiana, call 974.402 N434v v.1.
[Pike,] Sara, d. John, Nov 19. 1659
Source: Vital records of Newbury Massachusetts to the end of the year 1849, vol. 2, Marriages and deaths, (Salem: Essex Institute, 1911), 694; digital image, Internet Archive (https://archive.org/stream/vitalrecordsofne22newb#page/n643/mode/2up); imaged from Allen County Public Library, Fort Wayne, Indiana, call 974.402 N434v v.2.
John Pike of Newbury is known to have removed to Woodbridge about 1665 and died there about 1689. As we know Sarah, wife of Christopher Strout was living at this time, her omission from the will of John Pike suggests she was not related (portion of the will abstract follows):
1688-9 Jan. 24. Pike, John, senior, of Woodbridge; will of. Late wife Mary. Children - John, Thomas, Ruth, wife of Abr. Toppin, Joseph, Hana; legacies to Richard Worth, Obadiah Aires, John Worth. … proved January 20, 1689-90.
Source: William Nelson, ed., Documents relating to the colonial history of the State of New Jersey, vol. 23, calendar of New Jersey wills 1671-1730 (Paterson, N.J.: Press Printing and Publishing, 1901), 365; digital image, Internet Archive (https://archive.org/stream/documentsrelatin23newjuoft#page/364/mode/2up); imaged from Robarts Library, University of Toronto, Ontario, call AAP-9061.
Person 2. Sarah (wife of Christopher Strout and Joseph Collins)
Given the average age of first marriage in Massachusetts for females in this period is about 23 years old, so a guess of her date of birth is 1657. Her birth location is unknown, and I have not yet found any evidence of her parents names. As is hopefully already established above she is almost certainly not daughter of John of Newbury, leaving us to temporarily accept (pending further investigation) the other popular claim: that her father is George Pike of Marblehead. (NB: I did note there are other Pike families in the area that she could have belonged to)
Strout, Christopher and Sarah Picke, Dec. 2, 1680.
Source: Joseph Warren Chapman, comp., Vital records of Marblehead Massachusetts to the end of the year 1849, vol 2., Marriages and deaths, (Salem: Essex Institute, 1904), 414; digital image, Internet Archive (https://archive.org/stream/vitalrecordsofma02marb#page/414/mode/2up); imaged from Boston Public Library, call 1112505. Note: Sarah Picke is not identified as being "of Newbury" nor "of Woodbridge" which can be seen as 'negative evidence' supporting the idea that there are two different Sarahs.
Based on surname usage in the administration of the estate of Christopher Strought, Sara was married to Joseph Collins Between 9 Jul 1715 and 25 Oct 1716
Source: Barnstable County, Massachusetts, Registry of Probate, Vol. 3, 243-246, Estate of Christifur (sic) Strout of Cape Cod, 1715-16; digital image, "Probate and guardianship records, 1674-1950 [Barnstable County, Massachusetts]", FamilySearch (https://familysearch.org/ark:/61903/3:1:3Q9M-C9YB-53DS); imaged from FHL microfilm 1838958.
Based on being named in the will of her husband Joseph Collins (and therefore living), she died some time after 25 Feb 1723/4.
Source: Barnstable County, Massachusetts, Registry of Probate, Vol. 4, 171-2, Last will and testament of Joseph Collins of Eastham, 1723-24; digital image, "Probate and guardianship records, 1674-1950 [Barnstable County, Massachusetts]", FamilySearch (https://familysearch.org/ark:/61903/3:1:3Q9M-C9Y1-33L9); imaged from FHL microfilm 1839286.
A headstone for Sarah is found at Mount Pleasant Cemetery, South Portland, Cumberland, Maine, alongside some of her Strout children.
Source: Find A Grave, database and images (http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=41723806), memorial page for Sarah Pike Strout Collins (1660-1724); citing Mount Pleasant Cemetery, South Portland, Cumberland, Maine. Note: The contributors to this memorial (erroneously?) associate her as the child of John Pike of Newbury born 1655,
Also see:
Anna Chandler Kingsbury, [notes], New England Historical and Genealogical Register 69 (1915): 91; digital image, Internet Archive (https://archive.org/stream/newenglandhistor69wate#page/90/mode/2up); imaged from David O. McKay Library, Brigham Young University, Idaho, call F1.N56 v.69.