Crick's hypothesis was inspired by the fact that living organisms seemed so - to use Behe's terminology - irreducibly complex, that it seemed to require a miracle for them to appear. So instead of adopting that explanation, he toyed with the hypothesis that it evolved through natural processes somewhere else, allowing more time for the process to occur, and then the aliens shot a rocket here with microbes in it. Presumably they sent a rocket, instead of bringing it themselves, because of the prohibitively long distance and time involved. This is all in his book, Life Itself.
But if the aliens designed life, instead of it evolving, they still could have sent microbes in a rocket ship.
If God designed the first bacteria on Planet X, it's possible he didn't need to use a rocket ship.