New Chelsea head coach Liam Rosenior promised more to come from his second string after they swept aside Charlton 5-1 at the Valley in his first match in charge.It took a patient first half before the opening goal of the FA Cup third-round tie and of the Blues’ new era arrived from the unlikely boot of defender Jorrel Hato.Rosenior made eight changes after watching Wednesday’s 2-1 defeat to Fulham and soon the players largely forgotten by former boss Enzo Maresca were firing, including Facundo Buonanotte’s cross for Tosin Adarabioyo to head home their second goal.