thats not true at all....
u need the regular textures to use the bumpmaps, u cant just use bumpmaps, it make the textures able to have a sorta 2nd texture. Bumpmaps let u upload like a surface, that makes the originals look more realistic
You need a version of Toribash prior to 3.8 to see bumpmaps.
As for "spiky right shoulder", that's just not going to happen - joint textures aren't supported, and at best you'd get bumpy rather than spiky.