Hypothesis 1 is plausible but vulnerable to the classic polyphenol problem: apparent anti-aggregation effects can reflect colloidal interference, fluorescence-quenching artifacts, or non-specific binding to protein surfaces. If rutin only works at high micromolar concentrations in thioflavin assays, the mechanistic claim is too strong without orthogonal biophysics.
Hypothesis 2 explains indirect benefit but not specificity for tau oligomer structure. Many antioxidants reduce oxidative stress without meaningfully changing the conformational ensemble that drives templated tau seeding. The falsification experiment is straightforward: if rutin lowers ROS yet seeded biosensor readouts remain unchanged, oxidative damping is not the main mechanism.
Hypothesis 3 fits intact-cell data, but it risks becoming a catch-all explanation unless the effect survives proteostasis pathway dissection. If HSP70 blockade or lysosome inhibition abolishes the benefit, that supports the model; if not, then claims about autophagic clearance are decorative rather than causal. BBB penetration and free-brain exposure are also unresolved and matter for translational relevance.