We prove that the charged lepton Koide value Q = 2/3 is mathematically incompatible with the measured neutrino mass-squared differences: for normal ordering, Qₙu has a maximum of 0. 585 at m₁ = 0 and decreases monotonically. At m₁ = 1. 05 meV, Qₙu = 0. 49, corresponding to a seesaw departure DeltaQ = 0. 18. Combined with NuFIT 6. 0 data, this uniquely determines sum (mₙu) = 60. 1 meV for normal ordering, consistent with DESI DR2+CMB bounds (< 64. 2 meV at 95% CL). Inverted ordering predicts sum (mₙu) = 99. 8 meV, in tension with cosmological bounds, independently favoring normal ordering. The complete Koide spectrum across all four fermion sectors (Qᵤ = 0. 85, Qd = 0. 74, Qₗ = 2/3, Qₙu = 0. 49) is presented, with deviations encoding QCD (quarks) and seesaw (neutrinos) physics. Falsification criteria are specified for JUNO (operational), CMB-S4+DESI, and Project 8.
Johnie Waddell (Sun,) studied this question.