Thanks Diana ... I had noted that death record, but haven't checked it yet. Obviously it's worrying for my theory, as the decedent is exactly the right age, although the location, while near London, is not particularly close to his 1871 location (of course, under my theory he had moved to Southport, where his 2nd son was busy being born at this time!).
That's why I thought I would first lay out my theory to see whether anyone completely destroys it. If not, then yes, I'll have to check out that death record.