The discussion centers on comparing the values of $\sqrt{7}-\sqrt{6}$ and $\sqrt{6}-\sqrt{5}$ without using a calculator. Participants analyze the differences by squaring both expressions to simplify the comparison. It is determined that $\sqrt{7}-\sqrt{6}$ is larger than $\sqrt{6}-\sqrt{5}$. The correct reasoning involves understanding the behavior of square roots and their differences. Ultimately, the conclusion is that $\sqrt{7}-\sqrt{6}$ exceeds $\sqrt{6}-\sqrt{5}$.