A particularly old debate is "Gradual vs. Sudden" enlightenment, which of course, really is theoretical in once sense because of the actual need for practice. Pre-Nibbanic states are not new to "Buddhism" as the Buddhas' teachers were not Buddhists and from my research, the Buddha took up an Upanishadic stance in accepting them as teachers and in doing pranayama or as the Digha Nikaya states "experiencing violent winds when stopping the in/out breaths out of the mouth, mouth & nose, and mouth/nose/ears and mouth/nose/ears/closing the eyes" Comments?