All of Local 7's officers, divisional stewards and departmental stewards shall have top seniority during their term of office in that order regardless of length of continuous service for the purpose of layoff and recall. The only exception to this section is where there is more than one steward in a division or unit and there are different zones; the stewards shall exercise their seniority so that all zones will be covered. They shall return to their original standings on the seniority list at the end of their terms of office.