The temperature-dependence of f-d hybridized band dispersions and Fermi-energy f spectral weight in the Kondo lattice system CeCoIn5 is investigated using f-resonant angle-resolved photoemission (ARPES) with sufficient detail to allow direct comparison to first principles dynamical mean field theory (DFT• DMFT) calculations containing full realism of crystalline electric field (CEF) states. The low T ARPES results, for two orthogonal (001) and (100) cleaved surfaces, show the counterintuitive result that features peculiar to the localized f-electron 3D Fermi surface found in DFT calculations nonetheless display clear itinerant felectron participation, consistent with the low energy scale description of DFTDMFT. Also the ARPES T dependence of three different f-d hybridization scenarios, with additional microscopic insight provided by DMFT, reveal f participation in the Fermi surface at temperatures much higher than the lattice coherence temperature, T ≈ 45 K, commonly believed to be the onset for such behavior. The observation of a T-dependent CEF degeneracy crossover in the DMFT theory, below T, is specifically highlighted.