If Grey and the other boats ARE NOT in the "zone" when blue reaches the zone .... then they have no Overlap/Inside Rights. It's a "snap shot" .... not a continious video. Now "Grey" may retain her Starboard Rights ... but if Grey enters the "Zone" AFTER "Blue" ... NO RIGHTS ....

Now if "Grey" reachs the "zone" first .... well then yes ... "Blue" will have to give them all mark rounding room ... since they (all three) appear to be overlaping each other. But if their overlaps is broken before entering the zone ... then they lose their "Inside/Mark" Rights .... "Grey" will most definately have "Inside/Mark Rights since she is in front of a line extending from "Blue's" transom ....

This is a VERY tight situation ... where a second or two will amke the difference ....

Harry