Those living in centers are mostly younger members, while those living outside are mostly older people with children and other responsibilities. Their missions should be the same though. Of course home members must fulfill their external responsibilities, but they should still do God's work. Not all day. Home members should find similar hours to do God's work, i.e. to meet people and visit churches.
Atoms consist of a nucleus and electrons.
Matter cannot exist with only a nucleus or electrons, both are needed. I often hear that this relationship isn't good enough though. Whatever the circumstances, center members must have good give and take with the home members. Home members should visit the center and participate in the various activities there. If this relationship isn't good enough we cannot bring new members.