I’m having a little difficulty following how all these relate.
The first link is an interesting article on Janet Stewart, whose daughter married both a Montrose and another Stewart. But no clear connection to McCandlesses. She and her issue don’t seem to appear in the lineage list in the third link.
The second link is to a lineage comparison tool at WikiTree, but I’m not sure who we’re supposed to be comparing.
The third link has a McCandless/McCanles (notables: David Colbert McCanles, Byron & Bruce McCandless, etc.) female-line ancestry going back quite a ways, and may help explain various claims over the years relating to Gordon and Campbell clan connections, and has Stewarts/Stuarts in there again, but I’m not seeing a connection to the Janet Stewart in the first link.
I checked out the “Robert de Vere (abt. 1240 – bef. 1296)” entry and “Joan (de Vere) de Warenne (abt. 1264 – bef. 1293)” entry at the third link, but no “explore more” option is available there. Maybe I just don’t know enough about the WikiTree site yet.