Diego Costa is back to his demonic best , David Luiz appears to be a calming , constructive presence at the heart of the defense .
Eden Hazard seems hell - bent on regaining Diego Costa 's title as the best player in the division .
Diego Costa is back to his demonic best , David Luiz appears to be a calming , constructive presence at the heart of the defense and Eden Hazard seems hell - bent on regaining his title as the best player in the division .