SF will never have a lead that is safe, even w/ that D. If KC gets a 2 score lead, it's a different story - I don't think the Niners will fare well if they have to come back & put the game on Jimmy's arm.
I think that will be how it will play out, too. Reid has really been focusing on getting KC off to a quicker start. I don't think the game will be all that close.
Regardless, it's kind of a joyous thing to wake up and not worry about the Patriots playing. It's been said a million times this week, but their absence is glorious.