The ecosystem we are talking about is Earth; therefore, decreased entropy is only required on Earth. Nobody is saying that the entropy of the Sun is decreasing. It is increasing massively, supplying the Earth system with abundant entergy.
Yeah, I know decreased entropy is required for evolution to work on the earth and you are the guy who believes in evolution. Therefore you are the one who needs to supply the equation showing decreased entropy on the Earth on a massive scale in order for evolution to 'work'.
You still don't understand your error. Are you the poster boy of evolution?