Point 1: the only ways to obtain strange coins is by killing and engrams. Point 2: The only way for exotics to drop is via crucible strike and raid. Exactly how strange coins are earned. Point 3: players with less than 3 characters cannot get the 27 that others with 3 can Point 4: Xur is a failsafe, not something you should count onm Point 5, final: Xurs stock is random and could have many possible combinations.