Is CE-type orbital order the true ground state for LaSr$_{2}$Mn$_{2}$O$_{7}$?

Previous scattering and conductivity data for La$_{2-2x}$Sr$_{1+2x}$Mn$_{2}$O$_{7}$ (x=0.5) indicate the CE phase, predicted by Goodenough 50 years ago, is only stable between $\sim $100 and 200 K and below $\sim $100 K an A-type antiferromagnet is the ground state. We present scattering, magnetization and transport evidence that the CE phase is the ground state, but only in a very narrow composition range, presumably at exactly x=0.5. The vitally important roles of crystal homogeneity and methodology of transport measurements will be demonstrated for this conclusion as well as for the field of layered manganites in general.