If PBR textures don't seem to work for you, then it probably hasn't been added to EBE yet, or maybe it's bugged, try posting it as a possible bug on github.
There is no displacement texture in gameguru, these are the textures that gameguru uses:
PBR:
_color
_normal
_metalness
_gloss (this is actually a _roughness but renamed to _gloss)
_illumination or _emission (if used will override the _detail map)
_cube
_ao
_detail
_height (height map, probably closest to displacement we have, however the last i heard Lee said he hadn't connected it up yet)
DNSI:
_D (your base colour/texture map)
_N (your normal map)
_S (your specular map)
_I (that's an uppercase i, not a lowercase L. your illumination map)
_cube
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