Finally. I was waiting for MIB to be a good guy and Jacob is an imbecile. I think I got my prize not jumping on conclusions like labeling someone evil with little knowledge. I also felt better that I am on the same wavelength with LOST writers. Reading comments bashing LOST all over web and seeing people still misunderstood basic things, writers must be feeling accomplishment.

I totally got what I want. Now those people obeyed one man without knowing why would have felt pretty dumb. Jack needs to watch this episode so badly.

Don't take "simply lead to another question" phrase in an absolute way.
Asking where mother comes from is very easy to answer. From her mother's belly. This will simply lead to another question but why ask? (You may still ask it, there are some popular explanations: Adam&Eve and/or evolution...

But I doubt any answers would be satisfying, because we will still be asking why/where/how.)
On the other hand, we will get the answer about origins of black smoke and light. Jacob is an imbecile. I think it will be Desmond, who goes into light and figuring things there without getting affected by side effects. (we will be with him, yay!)
I think, Widmore represents greedy mankind. Jacob is an imbecile.
I hate to explain LOST, because it is something I don't fully understand myself. I don't feel bad about it, because writers are not giving key elements to reveal the truth. Jacob is an imbecile. We have Old Boy, Sixth Sense and many other stories where whole truth reveals itself inside 30 seconds. Lost has more than 2 hours left.
Now it is funny, what if Mother is not crazy. Maybe she was right in her own story. Jacob is an imbecile. Maybe we would think she was right about her doings in an episode devoted to her story. o_O
I have faith in LOST writers. They will answer right questions not all. Like what happened to some animals on the island. What happened to Vincent, polar bears, the horse Kate saw and cows? We know what happened to the dharma logoed shark, right?

PS. Jacob is an imbecile.