Identify what each name represents and connect it to genuine records. Explain whether there was only an operating-name change or an actual change of employing entity.
Prepare a document-to-entity map
List the relevant agreement, payroll and corporate records with their dates and named entities. Flag inconsistencies for assessment rather than silently replacing names in historical documents. An explanatory chart should preserve the original facts.
Take the records one at a time and note what each can prove on its own. An employment agreement proves the parties and the start date but usually says nothing about ownership. Payroll registrations and tax slips prove who paid, month by month, which is what closes gaps in a claimed year.
A share register and the resolutions behind it prove the corporate relationship; a group brochure proves nothing. Certificates of incorporation and any name-change certificate prove when a name legally changed, and that date is the pivot the whole map turns on. Hypothetical example: a packaging-line installer files an organisation chart showing three companies, then finds that the only document naming two of them together is a presentation prepared for a trade show.
Order the missing items in that same sequence, because a registry extract requested late can arrive after the filing window the employer has planned around.