By Daniel Moxon Christian Horner has not done enough to satisfy McLaren chief Zak Brown who has “big concerns” over Red Bull’s ownership of two Formula 1 teams. The energy drink’s flagship team is, of course, the Red Bull Racing outfit which dominated the grid this year. But the company also owns the soon-to-be-rebranded AlphaTauri team which has, historically, been used to blood their talented young drivers in F1. Going forward, the teams plan to work even more closely together. The 2024 AlphaTauri car will borrow as much from the Red Bull car as the regulations allow, while there are suggest…