Facts. John Rolfe married  name unknown. She is not mentioned as dying in Bermuda so it can be assumed she died in VA before 1614.
You say 'her name is on the web' but can it be verified? It is not mentioned by writers of the time, and appears to be very much a 20thC assumption and I have never seen any proof
John Rolfe married  Pocahontas Verifiable -writings made at the time, and still extant, by John Rolfe.
Issue one son Thomas c 1615 - verifiable by writings at the time and extant.
Pocahontas's death in Gravesend Kent UK, verifiable by entry in parish registers [extant] and writings at the time [extant]
Wife  known by will of John Rolfe made Mar 1622, when he mentions his wife Joan, and children Thomas & Elizabeth.
Your Quote …. Even though John Rolfe's will is available they do know know that the will said that That Thomas Rolfe had to be married to inherit. Thomas was 16 in 1630 when the Will was proved. At age 18, Thomas Married. That is a lot of incentive and those that were raising him had a lot of incentive
That is not a correct interpretation of the will. John, as was normal in that period, left the care and management of the estates of his under age children to a guardian, which they would inherit when they came of age Each would then be free to leave to their heirs. If Thomas had no heirs then it went to his sister Elizabeth, and if she had no heirs then to Thomas.
Quote from will reads….If Thomas espouse & marry with consent of my father in law in his minority before he is 21 then he to have the rents etc, if he died before marriage or 21 then my daughter to have premises at full age or marriage with consent of my father in law.
Muster taken after massacre, daughter Elizabeth alive [record extant].
From here I believe the descent maybe speculation
You speak of other wills. Could you inform me of where and when any wills other than John Rolfe's are to be found and the date/s, and details within?
Who was Thomas Rolfe Jr born 1645?What documentary evidence supports this?
You mention his wife Elizabeth.What documentary evidence supports this?
Thomas Rolfe - who is he, and what documentary evidence supports this?
Your quote……They are conducting digs at Kippax at Hopewell, Virginia right now. That is where the Rolfe's and Poythress graves are. They should find some evidence of those other children there. Do we have to wait until they publish their report. Seems to me, that someone should advise those heading the study, of those 3 children and to look out for them. Wilma
Considering how many people have been buried in the area over 300 years I think it very unlikely that any remains could be positively identified As John Rolfe died in Jamestown I believe that the grave would be there.
I await your comments, observations and sources with anticipation.