Warden: He seems like a kind man, if firm. Duncan is nicely summed up by the Warden when discussing him with Alistair. While Jory had indeed drawn his sword, he did so while backing away from Duncan. That doesn't mean he won't withhold information concerning the lethality of the Joining or stab Jory when he panics and tries to back out.
He then gazes with Tranquil Fury at the lit beacon, and has deduced that Loghain left Cailan and his forces to die at the walls of Ostagar.
He also seems to have connections everywhere in Ferelden. He has been a Grey Warden for quite a while now and commands great respect. The Warden-Commander responding to the growing threat in Ferelden and Team Dad to Alistair, Duncan is the one who recruits the PC. I expect you to be worthy of that title."