The man said himself that he had waslked the whole island looking for it but couldnt get to it. Im guessing because only the protector could. That was before he became smoke though but still. Then he walked ahead of Jack right to it????? And also,he is smoke and had plans of his own about how to use the light to leave the island...so why did he not go to the source before now, like in the last centuries that he had just hanging around. and why did he need desmond? surely he could smoke his way down. My point is that I found many aspects of the man in black's story to be really weak in the finale. His death sucked. We didnt see him transform into smoke - that would have been awesome. Why did he not transform to kill jack like?! I love Lost but the finale left a lot to be desired...it was so good yet so weak.