A singularity is a singularity no matter how much mass it is composed of. They all behave the same way essentially. Adding more mass does not change the singularity in any essential way, only outside the event horizon do changes take place. What equations are you using to calculate the density of the singualrity anyway? Using the classic equations of general relativity says that the singularity will be infinitely dense, but we know that not to be the case. That is why we use quantum mechanics in these cases. Anyway, could you please clarify what it is you're talking about, I don't see what it is you are questioning of me. CLARIFY!!!!!!!