There’s a relaxed, seasonal warmth upon entering the Button Factory for tonight’s mostly seated, limited capacity show, which sees Mark Kozelek at possibly the most critically acclaimed stage of his career – almost every song performed tonight comes from the last two years of his career – due in no small part to this year’s Sun Kil Moon LP, the mortality-fixated Benji. With no support act, Kozelek ambles onstage accompanied simply by a keyboardist and electric guitarist, standing with a sole tea-towelled drumstick for his lone tom, holding a straight beat with the intent of a serial killer for the entirety…