Agree with most of that. Rule 17 is also critical to some of the points made above.

Matt, in your "practical" paragraph, how would re-establshing overlap help B, in light of RRS 17? The only difference I see is that if the overlap is established under 18.2(c), the limit on B is A's proper course; while if it is established under 17, the limit on B is B's proper course. Not sure that I can think of a good example of where that matters, other than maybe at the far gybing lay line?

Mike