Dr Dave, Thank you for taking time to provide some additional thoughts regarding your experiences of rocks and bass spawning. Multiple opinions that are similar and backed by experience provide more trustworthiness to the advice.
Dr.Dave brings up a very good point about the benefits of rocks and gravel, in that "....add the rock just for diversity of habitat". "The rock can make great fishing attractors." Cody's experiences with rock habitats are similar to those of Dr.Dave. Numerous invertebrate species that serve as fish food live among the rocks that contain growths of periphyton (food for invertebrates). Rock piles enhance the food chain.
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