If China government decided to unban bitcoin then there's a possibility that it may result in bullish in my opinion although as you have said, bitcoin did not depend on China to grow which means it didn't depends on any country to grow but it is possible that a country can help it grow. I think this is a bit similar to what will happen to bitcoin if there's no more miner from china due to the ban the use and mining of bitcoin in China.
We can not say that China banned bitcoin exactly because the country does not have clear rules about bitcoin but I know that the country do not accept bitcoin as a currency but rather as a property.
Secondly is that there are still miners in China. China is the second largest in bitcoin mining.