OK quick but noob question.. So does wow use the highest rank if you do not specify one for macros? For example for my chain heal macro i have

toon1
/stopcast
/target toon2
/cast chain heal

toon2
/stopcast
/target toon3
/cast chain heals

and so on till toon 5 whom targets toon1. My question is do i have to manually adjust the ranking in each macro on each account to the next ranking up or does wow use the highest one?