WI/AHC: House of Bruce More Successful

Not sure. But leaving the queen in Edinburgh as regent while the king's absent (even if she's technically under house arrest during the Balliol invasion) can be a powerful symbol. And it's hardly like it would be expected of a Valois/Angevin girl to travel with her husband (although I've since found that Joan did go with her husband to France, and that during his imprisonment in England, her brother allowed her conjugal visits to the Tower where Davey was staying).
With a brother in the castle as Regent, being raised knowing what’s going on and this frees up the queen to travel with her husband to boost his moral.
 
With a brother in the castle as Regent, being raised knowing what’s going on and this frees up the queen to travel with her husband to boost his moral.

Fair enough. But according to what I've read on the Joan-David marriage, it wasn't happy on either side. Not Edward II-Isabelle or Henry II-Eleanor level unhappy, but they obviously had some issues.
 
The Scots' kings by the time of James V were still being addressed as 'your Grace', so I could see Edward III taking "your Majesty" if a son of Margherita's inherits the imperial title during his life time. But I agree, it probably would cause friction between London and Edinburgh. As to David having no kids, it's an interesting point you raise: he was in France for a long while, so that could account for why he and Joan had no kids at the start of their marriage (as I said upthread, I'm not sure where she was), but it doesn't explain after they were back together. Although David was hostage in England thereafter, and when he was released, Joan didn't go with him back to Scotland. So maybe the fault was on David's side.

Any people who know more about Scottish history of the period?

From what I've read, Joan was in France with her husband
 
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