I see the same, but my interpretation is slightly different. cyano colonizes recently dead coral, recently dead rock that got cleaned/ had organisms exposed, and recently dead algae. It seems great at exploiting conditions in/around decay.
I've thought about this, too, especially when I've seen cyano quickly take over a denuded coral skeleton. But, I also see cyano quite often soon after I expose previously unexposed rock (not much organics there, but there might be enough, and little biofilm/periphyton). I agree that decaying organics help facilitate a bloom of cyano and once it blooms it takes a while before it runs out of sustenance and competitors can then move in and potentially out compete it.
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