The a symbol in the pose morph shown above means that the pose is coming from external geometry, thus the geometry is separate from the object (absolute mode). It is possible from here to instead import the geometry into the tag and have the tag store the points internally (relative mode) without needing to keep the external objects, but the memory required to store the points in the tag would be similar to the memory required to store them externally. Either way, the different poses can't just all be gotten rid of because they have to be called on only when certain circumstances exist, the slider value is changed, different expressions call them to fix different poses, etc.
I've never used Character Creator 4 so I don't know if there is an option to export the poses to a single Cinema 4D morph tag using relative targets or if Cinema offers any import option to do the same, but that is something you might want to explore. As I said, either method will require the points to be stored somewhere in the file, so you probably won't get any big performance gains or much smaller file size.
Lastly, Cinema 4D should definitely offer some way to change absolute targets (stored outside the tag) to relative targets (stored inside the tag) in a single click one click option, but as far as I know it never has and doesn't currently. The only way I know of to do this is by redragging the external targets into the tag again and choosing upon reimport to make them relative instead of absolute and deleting the original absolute morph targets.