SPIRITUAL PATH & soul

I am into a field of research where I try to figure out the reasons of chaos in the world. In one of my researches when I was finding some conflicting threads in various religious prevalent beliefs, I found both Lord Budha and Lord Shankarya Charya had spoken of Soul. Can you throw some more light on seeming different statements of the Masters as per different times?

Sri Sri Ravi Shankar:

Lord buddha said that everything is nothing. Everything dissolves into nothing. He said, I meditated to see the soul and found no soul.

Shakaracharya said: “Who searched? Who found that everything is nothing? Who said I did not find the Atma? That is Atma. That is what upanishads say. Lord Buddha says the whole universe is empty like the space, Lord Shankara Charya says the whole universe is full like space - everything is in space.