There is no sort of alien origin theory for our own biosphere which does anything at all for evolution(ism). The simplest one-celled animals in the universe are still vastly more complex than anything man has ever built, they still could no more evolve on Mars, anything orbitting Alpha Centauri or anything else than they could here, and all that any such theory does is kick the can down the road a couple of blocks.
If you scale our entire solar system to something with a diameter of about one yard, then the sun would be a dust mote with about the diameter of the width of a human hair, we would be a few inches away from that dust mote, and Alpha Centauri would be four miles out yonder. The amount of time it would take any sort of a "life seed" to just sort of float out to any other star would be beyond anything anybody has ever thought of involving any sort of cosmic theory.