Sorry I haven’t replied recently ,but I’ve been to the IOM for a couple of weeks.
The record of Richard and Anne death was in the Monumental records of the Manx Museum, Which I assume are correct. Cannot explain why Brian Lawson’s list hasn’t got it.
Your info. On Elizabeth and John in the 1871 census appear to be correct.
The John who died 1909 who married Esther Colvin was my G/Grandfather who came from Jurby so it is not your John James.
The only John J Cretney who is undefined is age 39 at 208 Chester Rd Hulme Manchester as an Insurance Agent in the 1881 census lodging with a John Daggsley.

Regards Allan C