QUESTION 1: What’s the rationale for his birth showing circa 1590?
Maintaining it suggests he was about age 55 when Susannah was born. It’s possibly but not plausible.
SUGGESTION: Though I think Andrew was born between 1610 and 1618—with Susannah’s estimated birth year in mind—removing an estimated birth year is another idea.
QUESTION 2: From where did birth in Thurshelton, Devonshire, England come to this profile?
Without historical documentation proving his town of birth, one may merely conjecture where in England he was born. Yes, there were Newcombs living and dying in Devonshire, and some were named Andrew.
FAMILY SEARCH REPOSITORY (18 NOV 2024): Andrew Newcombs born elsewhere in England
— 1 born in Lincolnshire 1599 – https://www.familysearch.org/ark:/61903/1:1:JWHP-KFH
— Between 1600-09, no christening records for an Andrew in England
— Between 1610-19, no christening record showing an Andrew in England; only two were for unnamed Newcombs: 1 b. in Lincolnshire; 1 b. in Buckinghamshire
Between 1590 and 1619, here are shires where Newcomb babies were christened in England, excluding shires with less than 10 records:
171 Lincolnshire
42 Warwickshire
30 Middlesex
25 Yorkshire
32 Devonshire
23 Leicestershire
21 Durham
IN THE 1590s, there are 10 Newcomb christening records in Devonshire, but none are named Andrew: https://www.familysearch.org/search/record/results?count=20&q.a...
BETWEEN 1600-09, there are 6 Newcomb christening records in Devonshire, but none are named Andrew: https://www.familysearch.org/search/record/results?count=20&q.a...
BETWEEN 1610-19, there are 18 Newcomb christening records in Devonshire, but none are named Andrew: https://www.familysearch.org/search/record/results?count=20&q.a...