Buddhist theories all summed up to the point of Nibbana. They have reached the goal, gone there(Tathagat). They conclude holy life is lived and goal attained. Cessation of becoming(No new formation).
But, when asked, Do Tathagata exist after death? is absurd question. It is that our individuality arise and ceases. So, why the buddhist assume there is stopping of birth and death? Tathagata is synonym for ocean, where waves are arise and passes away, which we calls individuality. Tathagata is the root of Tree of Samsara. It's branches and leaves are species and karmic stations respectively. So, when one attain to the root, the whole tree(Samsara) appears as mere bubbles or foam, rising and falling, absolute impermanent. So, having so, why do they preach after attaining the Root, one attain freedom form birth and death? They are not. Because from root, a new one is formed and rolled on, in this continuous existence. That's why, its been asked by some of recluse of higher wisdom, Do Tathagata (the one who goes to that, the one who ceases) exist after fall of body and life? Buddha answered: Silence! I feel that doesn't stop the new creation or new forming of individual. Hence I conclude, there is no such freedom from birth again. Why?
My assumption is that, the one who arise and ceases, doesn't exist in reality! It's like dream of someone else's and dream can't be true or real. It's only the dreamer tends to be real. Tathagata(gati of the one)literally means to merge in Brahman. The dreamer. And see this universe as mere dream. So,it appears that no new dream arise after cessation of current dream, but not so. You can control the dream but not the dreamer. The Brahman. That's why in Indian village, Saint Chokha says, 'What a miracle! The God of god is gone mad!' He is saying about Brahman. Also in Bhuridatta Jataka, The Arhats said the same thing. ,