I know why Azog is there, I just don't get why they had to change it from BOLG to AZOG. BOLG was AZOGs son and when Azog was killed he swore vengeance against Thorin, and we all know how that eventually turned out for our poor King Under the Mountain.
Also Gollum wasn't being held all that time, he wasn't prisoner in Mordor for the 60 years, he was out wandering, looking for the ring.
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