Okay, so, if the Protheans cultivated the Asari, going so far as to become a symbol in their faith (protheans can be seen beside the Asari Goddess as her guides/mates in the temple where you find the beacon on Thessia) then how is it that the Asari didn't realize that their race had Prothean influence sooner? Especially Liara. Surely, as the Shadow Broker, she had the resources to not be surprised by the discovery on Thessia.