If the fifth body becomes available while the physical body is still alive, in which body will that person be born after death?

According to Osho, if the fifth body awakens while one is alive, rebirth in any of the first four bodies does not occur. Awakening and the fifth body are one; earlier bodies are dropped, and the question of 'which body' applies only up to the fourth. After the fifth, being unfolds without those bodies; the only 'birth' is a non-physical entry into the sixth body.

If you truly awaken to your fifth inner body, you don’t have to be born again—you just move on to a subtler level without returning.