just realized this today as i was looking around on my alts
all 3 captions were taken at the same server in the same day at around the same time and all have different ninja combinations, also the ninjas are reseting everyday just like the other items.
so all players get different ninjas combinatios at random from the preselected pool?

http://image.prntscr.com/image/625804d087ed4467991377a380087d45.png

http://image.prntscr.com/image/a5217a4203f54419bf196ba65dafe701.png

http://image.prntscr.com/image/1b1282ee4fa5478c94474706f8581d0b.png