By Daniel Moxon Helmut Marko has lifted the lid on the “toxic” relationship between Max Verstappen and Carlos Sainz when they were last Formula 1 team-mates. They raced together for Toro Rosso for a little over a year, before Verstappen got the call-up to join the main Red Bull team. Sainz remained with the sister squad until the end of 2017, when he left for Renault. In their one and only full season together, despite being the younger racer, Verstappen comfortably got the better of his team-mate. He scored 49 points compared to Sainz’s total of 18, which paved the way for the Dutchman to lea…