Can any one answer this question.

At the time? It was DMSA for me. But I don't believe i was cured, rather it reduced the load and enabled my body to improve, but I had not done enough, nor had I used alpha lipoic acid to chelate the organs/brain. So highly possible I had far more mercury still in me than I was aware. But DMSA must have played a pretty big role, because I would not have improved otherwise.

I just don't think it goes further than chelating the more accessible areas. But it's good to use earlier on because it reduces the blood levels more appropriately and aids ALA in chelation also.

Cilantro I don't know about enough to give an answer.

Cilantro mobilizes metals in the central nervous system, and also from intra cellular areas. A recent animal study showed that it is more effective in removing metals from the brain than any other detox agent. It's best to take 30 minutes after chlorella. It's best to take organic cilantro, which can be found in NDF. It also contains uncontaminated chlorella.
There is also cilantro tea you can drink which clears the brain of many toxins.