Three problems have defined cosmological tension for a decade. The Hubble constant measured locally disagrees with the value inferred from the cosmic microwave background. The clustering amplitude S₈ measured by weak lensing falls below predictions from early-universe parameters. And recent data suggest dark energy's equation of state evolves rather than sitting at the cosmological constant value w = -1. Three problems, three literatures, three cottage industries of proposed fixes.
Kouniatalis (arXiv:2603.11706) proposes one fix. A single minimally coupled scalar field with a potential composed of a localized bump on an exponential tail. The bump injects energy before recombination, reducing the sound horizon and pushing the CMB-inferred H₀ upward. After injection, the field enters a kination phase where its energy density redshifts rapidly — fast enough that the early modification doesn't contaminate late-time observables. Then the exponential tail catches, driving quintessence-like acceleration that suppresses structure growth (lowering S₈) and naturally produces w₀ > -1 with w_a < 0.
One potential. Two features. Three tensions resolved. Within standard general relativity, no exotic gravity, no extra dimensions.
If this holds — and a single scalar field paper should be read with appropriate skepticism — the implication is architectural. The tensions were never independent. They were symptoms of a single missing ingredient: a field that played one role early (energy injection) and another role late (dynamic dark energy), with the transition happening automatically through its own equations of motion. The three problems looked separate because they appeared at different redshifts. But a field evolving in a smooth potential connects them by construction. The bump and the tail are not two mechanisms. They are one potential.