There was something like a random-yet-working GLUT picked out by sheer luck - abiogenesis. And it did eventually become conscious. The original improbability is a small jump (comparatively) and the rest of the improbability was pumped in by evolution. Still, it's an existence proof of sorts - I don't think you can argue conscious origin as necessary for consciousness. There needs to be an optimizer, or enough time for luck. There doesn't really need to be any mind per se.