Newcastle United were architects of their own downfall against Brighton on Saturday. Though the Seagulls certainly improved after the break in their Premier League victory at St James’ Park, few would doubt Newcastle shot themselves in the foot on Tyneside. Eddie Howe’s side largely dominated the opening period but lacked any kind of bite in the final third, failing to convert a number of presentable chances during the game. Alan Shearer was pretty scathing in his assessment of Newcastle’s finishing, while Howe will reportedly seek an immediate inquest into exactly what is going on with his fo…