Former England captain Michael Vaughan suggests England must win the fifth Ashes Test in Sydney to solidify the futures of captain Ben Stokes and coach Brendon McCullum. Despite a recent win in Melbourne, Vaughan described the match as a 'lottery' due to its short duration. He believes a strong performance in Sydney is crucial for the management's continuation, though he anticipates Stokes and McCullum will likely remain if they don't suffer a significant defeat.