The actual origin of living things themselves and the possible transition of inanimate matter to living matter is still under heavy investigation.
Since you said “developed” though and this implies that life was already around, then, evolution is the only theory hands down.
Science isn’t democratic, we don’t sit around and take a straw-poll on the theory we like best. It’s not really like the humanities either where each idea has supposedly equal merit or you can debate things ad nauseum (like in philosophy). We go where the evidence points us and at this stage, evolution looks like the best explanation and it has a heavy basis in evidence.
I dont understand your orchestration question nor your law question.
Everything scientists discover about the natural world has already previously existed, Gravity didn’t come into being when we could describe it mathematically, evolution was occurring before Darwin described it and diseases existed long before we knew what caused them.
It’s a bit like storing a bunch of your personal items in a dark room of your house. You come back a few months later, the objects in the room have always been there but you don’t know whats there until you turn your torch on and shine the light. Science is a bit like that.