PF Registration - Specimen Signature Card - Explanation regarding details required in the form

In the format of specimen signature, the website mentions 'Please upload for all employers and for Authorised Signatory if any' and place is given for all 4 employers. The establishment in question has only one employer - so why they have given 4 employers to fill.
Can anyone please explain?

unless it is a proprietorship firm, there should be more than one person in establishment , viz partners, directors, trustee etc
all concerned persons data is needed in form 5A, at the top of this paragraph it ask for no of employers, if there is filled 1 it will display only single if it is filled 6 then 6 boxes will get displayed for submission