Signing with one brand sounds great at the time because it’s secure, guaranteed income and you can sign and dance about it as if you’ve signed a professional contract. Ultimately, you can earn £5 from an Adidas contract and claim you’re a professional. Cole has signed a retailer led contract (Start Fitness), that’s where Adidas give a retail a budget for X, Y and X to return on investment, they’ve then dedicated some of that budget or all to Cole’s deal. It is by no means a professional athlete contract with Adidas handled by their sports marketing team.
The cons of signing to one brand is that you are then known as an Adidas guy, a Nike guy or a Puma guy. When that contract ends, it makes it very difficult to secure other work because your entire portfolio is one company and one tone.
In my experience, 80% of a one brand contract is paying for is the exclusivity of you not working with competitors.