Comparison of the parameter posteriors of the dynamical modeling performed with JWST-NIRSpec-only data (red), Keck-KCWI-only data (blue), and both combined (black). The four free parameters in our dynamical model are the ratio of the tangential and radial velocity dispersion σ_t/σ_r ≡ (1 − β_ani)^1/2 with β_ani being the amplitude of a spatially constant anisotropy profile, the MST parameter λ_mst, the main deflector’s Einstein radius θ_E, the power-law mass profile’s logarithmic slope γ, and the super-massive black hole’s Einstein radius θ_E, bh. We have imposed a prior on the total Einstein radius (θ_E² + θ_E, bh²)^1/2 based on the lens model posterior of Suyu et al. (2013), which dominates the θ_E posterior illustrated here. All of them are consistent at ≲1σ confidence levels. The JWST NIRSpec’s superior spatial resolution also allows for the exclusion of a large fraction of the prior volume in the anisotropy parameter (σ_t/σ_r) that is largely unconstrained by the Keck-KCWI measurements.