I've seen this happen because of accounting/corporate finance policy.

Payroll is an ongoing commitment. Consultancy is a temporary service. Moving people from payroll to consultancy means they can reduce overhead in financial projections. Even though consultancy costs more, and employs the same people, it makes sense to do if it means you can convince shareholders and analysts that Opex will shrink in the future, and therefore profitability increase, and therefore the share price increases.