I think Jimmy G can be at least be reasonably effective. The anemic offense that the Broncos had in Super Bowl 50 certainly was. I trust Shanahan to be able to cook something up, especially with everything his solid, well above average offense has at his disposal. And I don't they will be "playing from behind" that much to begin with. To make matters worse (for the Chiefs), the 49ers defensive line has a MUCH better rotation to last four quarters than the Chiefs do. You can make the "but the Chiefs defense will barely even stay on the field" but I don't buy into that theory.