The info you have on your website concerning Thomas Sturman's son John (that he married Dorcas Norrie) is actually the info on Thomas' GRANDSON, John Sturman II (son of John Sturman I). Thomas' son John I married Elizabeth (--), and they had two children (John II and Richard) before John I died young. Following his death, Elizabeth married Major John Hallowes and then David Anderson.
John Sturman II married a total of 3 times: 1st to Dorcas Norrie, d/o David and Bridget Norrie; 2nd to Elizabeth Spence, d/o Patrick Spence and Dorcas (--); and 3rd to Anna (--).
Also, Thomas and Anna (Lee) Youell's daughter Penelope's husband, Patrick Spence Jr., was the daughter of Patrick Spence and Dorcas (--). This Dorcas' maiden name was NOT Norrie.
Also, John Sturman and Elizabeth Spence's daughter Elizabeth had two other husbands (and children by each) that you don't have listed.
My line is from John Sturman II and Elizabeth Spence through their daughter Elizabeth, and I have lots of original documentation and notes on these early Sturmans (50+ pages on Thomas alone). Several of the sources you quote (especially the William & Mary and Tyler's Quarterly articles) contain MAJOR errors on this line.
I'd be happy to send you copies of my info. If you're interested, please email me directly with your postal address.