I believe i have found an answer to this topic that better suits my need for understanding.
First of all, i'd like to say that to those people who simply dismiss this subject for being irrelevant, the buddha wopuld not have answered it or just because is speculation, with all due respect, i think you are a bit mistaken.
I was simply exercising my attitude of investigation. The Buddha himself said that there should be honest investigation to his doctrine, he even names it among the seven factors of enlightenment, which i think is an attitude that corresponds only to an enlightened being. Do not accept his sayings just because he said so.
Investigate, speculate, reason about them.
In doing so, i have learned of course from what you all wrote in this thread, but i also came to notice that, effectively, rebirth and kamma accumulates within ourselves simply because we haven't realised annatta. We haven't experienced it with our deep insight, deep inderstanding, namely, Nibbana. While not cognitively and experiencially know (a knowing which is also a seeing) realise Annatta, our mental continuum keeps trapped in the illusion of self, and that illusion is what binds us to Samsara. Once the mind intrinsecally knows annatta, it pulverizes the ability of mind to trick itself into rebirth.
So, namely, this is basically what the suttas say, I'm not saying anything new here. As a matter of fact, it's quite the oppositte, and one feels almost embarrassed to find a truth that was there all along. Nevertheless, it's our way of learning. Through investigation and experimentation of the teachings.
Best regards to you all