You may love your marketing agency, but I'll let you in on a secret. If you're a business owner or director of marketing that's paid 5, 6 or even 7 figures for a 'marketing rebrand' lately call your accountant! Your marketing agency is cheating on you.
In the marketing world, whether you work for an agency or for a company, hiring talented subcontractors to provide bench strength is common. This can provide valuable skills needed to pull off a project assignment.