Hi Janet
Just to clarify, I don't have access to the registers or MI's
The popularity of the names still remains an issue, especially outside of Helmsley.
However, your theory of their deaths between 1861 and 1871 is very plausible. If this is the case then the 1869 death of John Wilson aged 50 looks very possible, there are only 2 or 3 more within that period in the Helmsley district:
Q1 1861, no age given. V 9d, P 261. Unlikely because in 1861 he was noted as a shepherd on Elizabeths' birth cert.
Q4 1866, aged 76. V 9d, P 251. Unlikely because first child would be born when he was 56, though not impossible.
Q4 1871, aged 66. V 9d, P 283. Unlikely because census had been taken, but still a chance.
I have found a death for a Jane Wilson: Q3 1862, no age given, Helmsley, bur/reg. V 9d, P 232.
There is a probably a good reason for John not being at home in 1851 and 1861, he was a farmer/shepherd, his residence may have been on the farm at that time, especially if he spent some weeks away at a time.
I haven't yet established any links for Jonathan Taylor or Ann Boyes; though it must be likely that Jonathan is a relative, as Mary Wilson may well be!
Hope you can get something from this.
Regards
Geoff