David Coulthard is certain that Lewis Hamilton is leaving Mercedes for Ferrari as the 2025 move is the Briton’s ‘retirement plan’ and is about enhancing his ‘legacy’ in F1. The Silver Arrows confirmed last Thursday that Hamilton has triggered the release clause in his contract. He has opted to leave Mercedes and replace Carlos Sainz at Ferrari on a multi-year contract. The 39-year-old has been in Brackley since 2013 but will race in red next year. Hamilton and Mercedes are the most successful driver-team pairing in Formula 1 history. His move from McLaren as a one-time drivers’ champion delive…