Disregarding maiden races, and with no additional handicapping, over the last 1,000 races or so:
One of the top three horses under “ALL” came in 60% of the time.
One of the top two under “ALL” came in 45% of the time.
The top horse under “ALL” came in 28% of the time.
One of the top six horses under “ALL” came in 95% of the time.
So there ya’ go.