IN re-reading the book, I think that Ollie was calling Superman "the best" in terms of ability to see and/or observe.
Last time, they brought in a team that could each look at an aspect of the crime scene (ex: Atom checking for microscopic particles), but only Superman has the raw power and super senses to look at everything at once.
So Supes is "the best" at seeing/hearing/smelling/tasting everything in the room.
