User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-25732759-20141120220802/@comment-1359322-20141120235343

Well the one who said that was Cao Cao.

"Basically she’s not interested in anything besides Great-Red. Out of the Top 5 world’s strongest not including Great-Red, the strongest one is Ophis, and there is a huge gap between her and the second strongest where you could say that she is on a totally different level. This is what the embodiment of Infinity means.”"

- Volume 11 Life 3, Part 2

And Cao Cao might not be aware of Shiva's true strength level.