kevalaṃ dvāveva svabhāvau bhavatā pratipāditau na punar ekaṃ vastu dvirūpamparasparaparihārasthitalakṣaṇatvād ekatvānekatvayoḥ //
You have only established that there are two essential natures, not that there is one entity with two forms, because unity and multiplicity have mutually exclusive characteristics.