Sir John Stewart, 1st Seigneur d'Aubigny - Parents are not Alexander Stewart and Janet Keith?

There are many web sites that give Alexander Stewart and Janet Keith as the parents of JOHN Stewart of Darnley-killed in battle near Orléans 12 Feb 1429, the person of this profile. However, these two disagree.

James Balfour Paul, The Scots Peerage (Edinburgh : D. Douglas, 1904), Vol. 4:344-6.
https://archive.org/details/scotspeeragefoun04paul/page/344/mode/2up
States Janet Keith, "was not the mother of Sir John Stewart of Darnley, as stated by various authorities."

https://fmg.ac/Projects/MedLands/SCOTLAND.htm#JohnIStewartDarnleydi... inserts a generation, having Alexander Stewart and Janet Keith the parents of John Stewart, who by an unknown wife, had the John Stewart of this profile.

JOHN [I] Stewart of Darnley, son of ALEXANDER Stewart of Darnley & his wife Janet Keith of Galston ([1360/65?]-after 10 Feb 1407). His parentage is confirmed by his mother’s 11 Dec 1406 charter cited above. His birth date is estimated very approximately to [1360/65?] from the estimated birth dates of his descendants, bearing in mind that he was born from the second marriage of his mother who was probably born in 1336 or earlier as noted above.
The name of John’s wife is not known.
John [I] & his wife had two children:
1. JOHN [II] Stewart of Darnley ([1385/90?]-killed in battle near Orléans 12 Feb 1429, bur Orléans Sainte-Croix).

What do you think? Should they be his parents or grandparents?