How did Gollum escape from Moria ?

[Legate of Amon Lanc]

Originally Posted by Gordis

I think Gollum climbed out of a light-shaft/window. He was a small, very agile creature and could climb like a spider.

If he could do that, he would have done that ages ago. But we are told that he was actually stuck in Moria and couldn't get out - he couldn't open the Western gate, because the doors were too heavy for him, and in the East, there were the Orcs. So if he could have used any of the shafts, he would have done so before. No, this won't hold.