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On the question on the role of energy in the Universe, the conservation of energy or how energy is lost and gained so that total energy is a constant is a property of a static Universe.
An expanding Universe where space-time is not static is not conserved.
Particles moving through space-time are energy conserved but the expanding space time itself is not conserved.
The non conservation of energy for expanding space time is important as it explains certain aspects of Cosmology such as why every object in the Universe is causally connected, to the formation of protons, neutrons and various light nuclei in the very early history of the Universe.
Regards
Steven
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