The luminosity of Leo P appears similar to the dwarf spheroidal (dSph) galaxies around the Milky Way. However, unlike Leo P, the dSph galaxies around the Milky Way contain little to no gas, and have no ongoing stars formation. This indicates that Leo P is what a dSph galaxy would look like if it evolved in an isolated environment and held on to its gas content. It also shows that the environment around the Milky Way has the effect of quenching star formation in its satellite dwarf galaxies.
McQuinn et al. (2015), “Leo P: An Unquenched Very Low-Mass Galaxy”, arXiv:1506.05495 [astro-ph.GA]