Rocks have random structure, not complex structure. Randomness does not entail consciousness. A feature of consciousness is that it is informative: it informs you about the external state of the world or about internal processes. But a random configuration of molecules carry no information. (A random string is information but it doesn't carry information, i.e. mutual information with another structure.)

There may be some consciousness in the rock.

The gist of these theories is that consciousness is isomorphic to specific aspects of information processing that can be quantified.

The levels of complexity involved are hardly comparable...