GEORGE RUSSELL admitted he would “understand” if Max Verstappen quit Formula One — and insisted no driver was bigger than the sport.Verstappen has been a huge critic of F1’s new rules — comparing them to Mario Kart — and hinted at the last round in Japan that he could walk away.It also emerged earlier this month that the four-time world champion’s long-term race engineer and close ally Gianpiero Lambiase was leaving Red Bull for rivals McLaren.