After an uncharacteristically feeble start by Chelsea to its Premier League title defense, the return of Diego Costa's fiery temperament was just what Jose Mourinho needed to rouse his under-performers against Arsenal. There was no goal from last season's top scorer in Saturday's 2-0 victory over Arsenal but the hot-headed striker's contribution seemed even more significant. Costa managed to escape being dismissed for lashing out at Laurent Koscielny before appearing to incite Gabriel Paulista into being sent off for a retaliatory kick on him right in front of the referee. More...