The cliffhanger

So who was John DAWE in Whitchurch the son of? (The end of my Spot the Flaw post refers)

An Isaac and Sarah DAW, where the baptism entry holds no further clues, no occupation, no residence.

Who are  my 3greats grandparents
An Isaac and Sarah DAWE / DAW.

Did I have a John in the family?
No.

Did any of the online trees readily available to check have one?
No.

How many Isaac and Sarah DAW couples around this time (or ever?) are there in this area?
The only one I know of are my lot, Isaac a miller of Newton Mill and wife Sarah SMITH.
The only other marriage that comes up on FindMyPast when searched for Isaac (with variants) DAW or DAWE between 1770 and 1810 is a Jun 1783 Halwill marriage of an Isaac DAWE and Grace PAGE, where that Isaac seems to have died in Sep, leaving Grace with an unborn son (John born the next year).
Not all the baptisms have been checked for any others showing parents as Isaac and Sarah that aren't already allocated to the family.

Can John "fit" with the existing children?
Yes.
At first glance I thought maybe not given he was baptized 1798 and their first child Isaac Smith DAWE, was baptized in 1797.
But looking at the actual baptismal dates:
Isaac Smith DAWE 31 Mar 1797
John DAW 26  Oct 1798
Sarah DAWE 15 Dec 1800 
It looks like yes he can fit.

Is this John the John who married Mary FRIEND?
Can't prove that as there are likely to be other candidates, but when the details of the ancestry DNA match can be explored on GEDMatch and compared with more than just my data we may have more of an idea about that from the DNA aspect.