That's what your took away from my post? Rofl. I tried.
Luck exists in the NFL, and I'm not talking about the new Colts QB. A marvelous stretch with no injuries on defense last season (to "key" guys or otherwise), recovering something like 65% of fumbles in games, historically low # of turnovers, +28 turnover margin, (this part's subjective) career years from previously bad players all mystically coinciding in the same season...
"SUSTAIN GOOD PLAY derp!". That's not "good play". That's miraculous play. In the NFL, a team that posts +10 in give/take is having a fantastic season. +28 is incredible... and highly unlikely to be duplicated. Don't take my word for it: these are historical trends, studied by people smarter than you or I. If you think +28 wasn't a gigantic reason the 49ers won 13 games, then the fuck am I doing responding in the first place?
The 49ers can easily sustain its good play from last year, but if that good play includes regression on a lot of the above towards what's normally "good" in the NFL, well... don't be mad when you're in a dogfight for the division at 7-6 come early December, trying to figure out how a 13-3 team could fall so far.
For your sake, I hope you're starting Kaepernick sooner rather than later, because Alex Smith can't throw a god damn 10 yard out pattern with consistency, and we all saw how comically easily it was to defend him in the NFCC because of that.