  We study the relation between measured high-$x_B$, high-$Q^2$, Helium-3 to
Tritium, $(e,e')$ inclusive-scattering cross-section ratios and the relative
abundance of high-momentum neutron-proton ($np$) and proton-proton ($pp$)
short-range correlated (SRC) nucleon pairs in three-body ($A=3$) nuclei.
Analysis of this data using a simple pair-counting cross-section model
suggested a much smaller $np/pp$ ratio than previously measured in heavier
nuclei, questioning our understanding of $A=3$ nuclei and, by extension, all
other nuclei. Here we examine this finding using spectral-function-based
cross-section calculations, with both an \textit{ab initio} $A=3$ spectral
function and effective Generalized Contact Formalism (GCF) spectral functions
using different nucleon-nucleon interaction models. The \textit{ab initio}
calculation agrees with the data, showing good understanding of the structure
of $A=3$ nuclei. An 8\% uncertainty on the simple pair-counting model, as
implied by the difference between it and the \textit{ab initio} calculation,
gives a factor of 5 uncertainty in the extracted $np/pp$ ratio. Thus we see no
evidence for the claimed ``unexpected structure in the high-momentum
wavefunction for hydrogen-3 and helium-3''.
