Well maybe. I view this as a low probability conjecture for now. As far as mass is concerned, i am much more inclined to rely on carbon. This is because of temperature and the disassociation of compounds.
Yet both can work together. We do need to master gravity and then penetrate the core to figure out the structure. That will be a while yet.
The take home is that our core is lighter than it should be based on known heavy metals. That confirms the need for lighter atoms..