With the Formula 1 summer break drawing to a close, Mercedes still haven’t confirmed their replacement for Lewis Hamilton. It’s been six and a half months since news of Hamilton’s move to Ferrari became public. There are likely two main reasons for the delay. The first is that Toto Wolff may have wanted time to assess Kimi Antonelli’s performances in Formula 2. The academy driver has long been considered the favourite for the vacancy. But Wolff needed to see if the 17-year-old was ready for the jump not only to F1, but to a frontrunning seat. The second is that he was holding out hope of signi…