Ok, so since joining the blades i've noticed a few glitchy things about Esbern but this time he has asked me to get him Dragon Bones and Scales, So I kill a Dragon, Take the scales and bones to him and when I speak to him he says "What was that? You'll have to speak up, I'm a little def in my right ear" Then walks away. So I go outside to where Delphine trains and an Ancient Dragon comes, So I thought, I must be Ancient Dragon bones, So Me and Delphine kill the AD and nothing happens when I take those bones to Esbern. So I started my campaign again, going through all the quests again.
Definetely not killing Paarthunax this time,Screw The Blades.