The only way to know what is Nibbana, one needs to get rid of avijja and tanha. There is no other way, any speculative knowledge and guessing will only harm yourself and give your wrong idea about things. It’s will make your mind more unclear. Rather than think your way out to get what Nibbana is, apply the process which one can know and attain Nibbana? Do not let ignorance run out like that as you harming yourself by doing that. It’s really not that hard to understand if one stops a bit and give it a thought.
Again sybe, you can not make it up with the thinking process make sense out of it prior to attaining any magga phala as you will be going of opposite direction actually and that what you are doing and that what I mean you do not practice Dhamma but you practicing thinking about Dhamma.