I think there is value in the principle of least surprise. And applying that here, I think it would be best to default to the suggestions tab of the identify page first presenting the species that is the best guess this website can provide, not filtered by the taxon of existing IDs which may be wrong. Which would be Visually Similar, with the taxon cleared. As the app does.
The thread on default filtering by taxon: https://forum.inaturalist.org/t/compare-suggestions-source-visually-similar-filter-by-taxon-by-default/673/12