There have been 31 Super Bowls won that didn't have Kyle Shanahan as the OC.
Sark didn't do as good in his first year as Kyle did his his second. Kyle didn't do as good as Sark did in his year 1. Different players/ different schemes, yadda yadda yadda. We all know Kyle is better but we should also obviously know you don't need his game to win a SB. Sark has all the tools to have a great offense and we have to give him the same benefit of the doubt. After this year we will have a much more clear idea of how valuable he is to our team. He has everything an OC can ask for, so it's on him to produce. Let's just wait and see.