There is so much misinformation out there, as well as sheer speculation merged in with documented relationships, that I sometimes despair.
I am descended from Johannes and Christianna Friedt through their oldest child, Heinrich (Henry), not their youngest, Johannes (John). But I believe that their son John is the one who married into the Kolb family, not the Detwiler family. His date of birth is variously given as July 3 or Nov. 16 in 1725. (Further evidence that this John Freed married into the Kolb family is that there's really no doubt that his sister Maria Friedt also married into the Kolb family.)
Judging from what I've read about the other John Freed, he may well be the Hans Friedt who emigrated on the Bilander Vernon in 1747 and was at least 16 years old then. It's entirely possible that he, too, was born in 1725. The story recounted in the Yellis Freed book is that he was an innkeeper who died after the battle of Germantown during the Revolutionary War at the age of 52. I very much doubt that the John Freed in my family line would have been involved there, as they were strict pacifists. See http://mikezs-place.tripod.com/zieglerdb/np31.htm
As to the parents of Hans Friedt of the Bilander Vernon, I have no idea.
On the other hand, the Friedts, the Kolbs and the Detweilers were all neighbors in Skippack Township, so I'd rather see some documents than engage in speculation.