Chukas: each individual has a gift

Rashi (20:2) explains that there is a connection between the people's demand for water and the death of Miriam recorded recorded immediately prior to their complaint. Until this point the people obtained water from from the well of Miriam which accompanied them through the desert, but with Miriam's death the well vanished and the people faced a crisis. Why is it that the well completely vanished and did not remain in the merit of Moshe or Aharon? The Sifsei Chachamim answers the well was a reward for the self sacrifice Miriam showed by waiting alongside the banks of the Nile and watching to see what would happen to the basket her baby brother Moshe was set forth in -- in the merit of her waiting by the water, she became the source of water. Moshe was a greater prophet than his sister Miriam, and Aharon in his position of kohen gadol was able to serve Hashem in ways in which Miriam could not, but neither Moshe or Aharon could substitute for the unique merit that Miriam had. There are people greater in Torah scholarship and avodah than any one of us, but the gifts each of us an individuals bring to the world have no substitute.