We're probably just quibbling about words now, but since that's what writers do, no big. :)

If the offshoots intersect "sometimes even more often than "very briefly"", I'd argue they're not intersecting. They're intertwining.

Further, things that intersect do not share roots. They come from separate places, cross, and move on.

Crenshaw's model was very simple. It only handled race and gender. It could handle more than she imagined, but it cannot handle economic class.