Newcastle United’s defensive problems continue. For a team who boasted the joint-best backline in the Premier League last season, Newcastle have fallen away in that respect. Only the bottom three, Nottingham Forest and Bournemouth have conceded more than Eddie Howe’s team thus far (45) and such frailties were exposed at Arsenal on Saturday night. Indeed, Howe reportedly looked “absolutely raging” on the touchline and it’s easy to understand why. His team were shocking defensively at the Emirates Stadium and boasted little in attack too, despite Joe Willock’s goal. Having already admitted the d…