I take this is a debate being held at your organization?

In this day and age of lean manufacturing, many of us wear many different hats. Without knowing much about your organization, Cavanna, I don't see a problem with the head of R&D also being the head of Quality.
The only time I see a potential conflict is when the head of Quality
reports to the head of Production. Those two often have conflicting priorities....one is to get product out the door and the other is to make good product.
Perhaps you could share with us a summary of the responsibilties that R&D and Quality have? Do you see a possible problem?