This thread is about the elements which were introduced in Naruto and about the actual history of Kishimoto's thoughts. I'll start with what Yamato taught us.
These elements are Fire, Wind, Lightning, Earth, Water
Now this specific diagramm that Kishi uses is a reference to Feng Shui:
On the outside we have a weaker circle. (For example: Wood is weaker than fire)
On the inside we have a star. This star is a stronger circle. (For example: Fire is stronger than metall)
As you will have noticed, metall and wood aren't Naruto-elements, although referenced by Kishi in Yamato and the Sandaime Kazekage.
To develop this circle into the Naruto-element-circle we exchange Metal
The relationship that Kishimoto presents to us is that of the star in the middle.
Now on the outside we gain another relationship between the elements. The "weaker"-circle. Fire is defeated, not only by water, but also by earth. If you throw a pile of earth onto a fire then that does the job as well.
So in essense...
This is referenced in the manga a couple times, very discretely. Every time I could find was with Sasuke who began noticing this.
I want to emphasize this:
Fire is useless against Sand and Sand is an Earth jutsu
. That can't be explained by Kishimoto's elemental circle but by the one we developed here.
And here we have Sasuke again, fighting against Killerbee.
Do you notice how the water keeps Chidori running on Killerbee although Sasuke is already gone? As expected water transfers Chidori and lightning-based jutsus. Again that shouldn't happen, according to the old elemental circle.