Yes, I have heard this and like the idea.
I found that quite making some sense as it discovers the genuine secrets of a MM which was lost in the Third Degree.
The First Grand Principal (equals to your Grand High Priest, but we have Zerubbabel, Prince of the People being the first, rather than the Prophet or the High Priest) is de facto our Grand Master in the Craft.
And all Royal Arch masons are encouraged to wear the Royal Arch jewel in Craft meetings to display the indissoluble link between Craft and Chapter.
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