Analysis of TM distribution in gradient architectures after high-temperature sintering is an elusive task when limited to a two-dimensional plane. Through a completely non-destructive TXM differential absorption tomography technique, Ni, Co, and Mn relative elemental ratios were attained across the entire three-dimensional structure spanning many particles from a synthetic batch. The presented study outlines a methodology to determine the statistical significance of depth-dependent elemental architectures in secondary cathode particles. The gradient architectures were fully quantified using morphological-based segmentation and Euclidean Distance Mapping. There was high elemental homogeneity between two particles across the three architectures. Statistically significant elemental gradients were present in all architectures. While the hydroxide precursors were designed by adding compositional layers to the same core, Ni0.9Co0.05Mn0.05(OH)2, TM migration took place during the treatment at high temperature to form the final oxide, evening out the initial compositional gradients toward the average concentration in the particles. There was an apparent correlation between the extent of migration through the secondary particle and the number of initial compositional layers. Since gradients clearly remained after the synthesis, it is possible that further systematic studies could quantify rules of design by manipulating temperatures of synthesis, which, in turn, may help guide future precursor synthetic targets. The methodology established to characterize the elemental gradient architectures was agnostic to composition and should be considered a critical assessment tool when pursuing cathode heterostructures with varying elemental content at the lab-bench to pre-pilot scale.