Newcastle United continue to frustrate manager Eddie Howe. Thrashed at Arsenal in the Premier League on Saturday night, the Newcastle boss admitted his team’s increasing inability to keep goals out was a “worry”. Indeed, the inconsistency his team has showed this season has confused Howe. Even after the morale-boosting win over Aston Villa late last month, he confirmed he had “mixed emotions”, having watched his side struggle against the so-called lesser teams this season. After all, this is a team who have beaten the Gunners, Villa (twice), Chelsea, both Manchester clubs and Paris Saint-Germa…