UV's missing on combined mesh (help please)

for the love of god ive been struggling for hours. as far as I know the uv’s are the same name. can someone please fix this model for me its killing me. the textures are showing just fine. but when I export it only some UVs show.

It seems that the problem is in the .mtl file: some “maps” miss the path to the image file, so you see blank areas when importing the .obj into Blender.
I think the easiest thing is to open the .mtl file in a text editor and add the missing links. Most of the maps have a name that is similar to the image file (eg: the “torso” map will need to know where to find the “torso.jpg” file), so it will be easy (hopefully) to add the missing paths.