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David Marshall's 'Genealogical notes anent some ancient Scottish families" https://archive.org/details/anent1884/page/119/mode/1up
adds an extra generation here between Sir James Schaw, Kt. and Sir James Schaw of Sauchie
So, Sir James Shaw x Isobell is the son of a Sir James Shaw of Sauchie, who is the son of Sir James Shaw m. Mary de Annand.
1.Sir James Schaw, Kt. x c 1431 Mary de Annand.
2.Sir James Shaw of Sauchie
3. Sir James Schaw of Sauchie x c1483 Isobell
I don't know if it matters / makes a difference to dates?