60% of Robin's soul energy alone was undoubtedly huge, Since birth he had a strong soul that exceeds his peers by a great margin, and it was not about the quantity of the soul energy he was born was, but the quality of primal soul itself!
His special soul is something that belongs to him and him alone, no soul cultivation can fill this gap, at least this is what Robin discovered during his research.
This, and addition to all those years he spent taking care of his soul energy and trying to Develop it day and night, thinking that it will help him in his research
Undoubtedly, there is no match for the strength of Robin's soul on Planet Jura, and it is still debatable whether the Emperors of Planet Nihari have souls as powerful as him at this point!
On the other side is 90% of Tree Father Hoffenheim's soul energy, an ancient being who has a long history of soul cloning research and has a soul energy level even higher than Robin at his peak strength.