Mighty Blow and Sword Saint abilities

[Resgrath]

Another question, I apologize for the number of questions I have on this particular class, I noticed that the adamant talent's DR and elemental resist says it stacks with any other source and I know that usually DR and resist does not stack so for clarity does the DR granted by sword saint sustained modes stack? Example being does the DR of battle synergy, raise the guard(giving DR to turn the blade), shield defense, and the active ability stonewall stack together?