Sing says it's execution and not philosophy. If that's the case then players must be held accountable. If today is any indicator, it seems that, at least for now, the niners are serious about making demonstrable change, that would have to include who gets to start.
So the question is who gets benched and who gets the start? Beyond the obvious qb position, what other positions need to be addressed.
To me the most glaring one is Rachal and possibly Davis (RT)(bring Sims back for the short-term), followed by both safety positions. Someone else to consider is Haralson, who has provided little pass rush and seems susceptible to the screen pass.