Kevin: Of course, as you already know, these Collinses, Nickens, Barnes, Scotts, Pentecost, etc are definitely an interesting set of surnames.
As you have probably already seen--there is a TN Legislative Petition (Number 72-1833-1 thru 721833-4) that does state that several of the "Nickings" are requesting the same rights, priveleges and perfect equality--that another set of Nickings' have already obtained.In this petition in Wilson County, TN--the "undersigned" Nickings' ----"that they are the reputed heirs of William and Frances Nicking whom they have always understood were of Portugus and from Portugal and settled in the US many years since".....
With all the research, family lore and personal interviews that I have had with all of these families--they usually, don't know anything much about Portuguese descent.However, as I have posted elsewhere, they usually claim Eastern Cherokee Indian. Of course, as you already know, they are listed as "Mulatto" and/or "Of Color" in official documents.
Most of these families were in Wilson County, migrated to Davidson County--and, then somewhere about 1900--appears that many of the Collinses headed to Oklahoma--to find and/or own free and/or cheap land.
I don't know that his will help, but if you had rather email me at email@example.com -- that would be fine.Regards........John M. Coakley