The deals are made based on projections and anticipation through exposure, growing fanase numbers and success on the pitch. Rather than exclusively on previous sale numbers. Lets face it, we didn't get 70m a year as a deal based on having sold that for Nike. We got it because Puma could see where the club was heading under Pep. Big swings in sales are no doubt taken into account, but it will be a small part of it all. In the exact same way the Raddison Blu didn't sign up to operate the new hotel based on how many rooms the club previously sold, but on the anticipated potential.
The big draw for puma is being associated with the club, the exposure, the brand being seen in the CL final etc. Rather than just the sales themselves. You can't claim on the one hand peiple buying fakes benefits puma through free advertising (I agree bte) and then on the other hand that shirt sales are what their deals hinge on.
I can't find it to prove otherwise, and won't put time into it. But I flat out refuse to believe the club get no percentage of shirt sales. It is such an illogical claim, that no offense to you, I just don't buy. I know you are involved and I trust most of what you say, but that one I just don't see.