How deeply have you looked at Craddocks in Moulton? That seems to me to be more likely.
I've unearthed the whole Moulton Craddock clan, which is closely related to the Kingsthorpe clan. I might have a few suitable candidates, but the problem is: there were no fewer than 3 John Craddocks, all born around Kingsthorpe in the 1760s (cousins or second cousins) so I am not sure who is who.
Anyone with a time machine that can go check?
I *know* for a fact that MY John Craddock married in Moulton in 1810, but since he was a widower I would need to know who he was married to before that. My JC left Moulton to go to Harrold between the death of his son (buried Oct Moulton 1817) and the birth of his daughter (baptised Harrold in Nov 1818). I'm therefore focusing on Moulton, Kingsthorpe and Harrold.
I'm just not sure whether Elizabeth Chapman is a candidate for *my* JC, though... The fact that it is a Harrold marriage does make sense with him returning later, but whatever would they have been up to in between 1791 and 1810? When/Where did Elizabeth die? And, for that matter, where was she from? I would assume she was from around Harrold, or it would be weird for a Northamptonshire boy to go all the way to Harrold just to get married.