Asuma couldn't have died because this is a chold friendly shonen manga, appealing to 5 year olds and teens alike. Therefore Asuma didn't die. So the only worthy explanation is that he is the AL. He got some scrub to talk to hidan and tell him to back off, while he pretended to die, and will soon enough go to meet Hidan and Kakuzu to mash their faces in. AMIRITE?!