Regarding your "Gen#1 Isaac Dilbeck", you have a good bit of the information. My additional information is that the original name was van Dilbeeck, because he was from the little town of Dilbeeck, which now is surrounded by the Belgic city of Brussels.He may have been Dutch or Flemish. He was the son of a baron, but apparently did not have a lot of resouces and so indentured himself to a German(Daniel Pretorius) in exchange for passage for himself and family on the passenger ship The America in 1683, as you have noted. He did live in Germantown, PA. He was a member of the Dutch Reformed Church of Southhampton.
I have more information about him and his descendants. Perhaps we can exchange data. I am trying to link back from my oldest known ancestor Jacob(1776-1840) to Isaac's sons but have not been quite able to do so. Jacob is most likely a son or a cousin of John George Dilbeck (Sr).