I'm aware of the Marquess' reason for doing this and it's as I stated.
At the time of the decision, the heir was an infant and would have
been completely oblivious to the inferences peerage pundits might have
put on the decision! Mountstuart has been used as a courtesy sytle by
the family in the past and hence there's family historical reasons for
using it again. Although interestingly they ASSUMED the style Viscount
Mount-Stuart on previous occasions. I suggest they may well have not
gone for Windsor to avoid confusion with the Earl of Plymouth's heir
(the style is Viscount Windsor, but he's referred to of course as Lord
Windsor).
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