The following was mentioned by Nampillai.

One time Nambi Thiruvazhuthi Valanadu Dasar explained Kanninun Siruththambu pasuram and completed it with the line "madhurakavi sonna sol nambuvAr pathi vaikuntham kANminE". Hearing that, a Srivaishnava asked "If a person in this world (leela vibhuti) recites this sincerely, how can we say that it becomes the other world (nitya vibhuti)?"

Dasar replied "After Kooraththazhvan's son was born, the walls between the two worlds were broken down and the two became one".

That is, Madhurakavi Azhvar's word that the place where those who believe in Kanninun Siruththambu live will become Srivaikuntha itself, was realized during Parasara Bhattar's time.