Striker must win over new head coach after tough first season at Liverpool – starting on Sunday at an inhospitable St James’ Park When Liverpool’s team bus turns a tight corner and inches down the narrow, covered, access road behind Newcastle’s Milburn Stand on Sunday, Alexander Isak will know there are no hiding places. After that coach pulls up, its occupants must navigate a set of painted steps before reaching the glass-doored sanctuary of the players’ entrance at St James’ Park. It is a sho…