Board Thread:Theories and Speculation/@comment-26537507-20150930205403/@comment-2120712-20151001094636

MS techs are like pre-loaded techs for one to use. My guess is that the techs you get depends on things like personality and your bloodline decent within the uchiha clan. However regardless of what techs you start off with, they all end up at Susanoo with said tech being "flavored" by what techs you had to master in each eye to obtain it.