By Sean Walsh Tottenham Hotspur warmed up for their north London derby at home to Arsenal in the worst possible fashion. Ange Postecoglou’s men were second-best all over the pitch in Saturday’s 4-0 hammering at Newcastle United. They can have no arguments with the result or the wide margin of defeat, no Erik ten Hag-isms about how they actually dominated the game with their possession or smattering of half-chances. Spurs remain a team and club in transition going from one extreme identity to another, and there are going to be bumps in the road, but this was the first time across Postecoglou’s …