Sorry, but I don’t understand what you mean here (I read what you wrote 2-3 times and just could not get it). Could you please expand?
In MN120 all modes of existence (ways of rebirth if you wish) are presented as a result of the convergence of the following, aren’t they ?
cittaṃ dahati, adhiṭṭhāti, bhāveti + saṅkhārā & vihārā + evaṃ bhāvitā & bahulīkatā = tatrupapattiyā saṃvattanti.
bearing in mind, directed thinking, cultivation/development of thoughts + intending & abiding + development & prioritization of actions = such and such (way of )existence eventuates.
Grabbing the function by its other end thus one has:
The eventuation/causation of different modes of rebirth and the ending of rebirth can be summarized as a function of any or all of the following factors:
i) what ones bears in mind,
ii) what ones focus his thoughts
iii) what one cultivates/develops in his thoughts
iv) on what one abides and intends
v) how one develops and prioritizes his actions
In terms of explaining the eventuation/causation of different modes of rebirth what is found in MN120 is perfectly aligned with what one finds in AN6.63:
Intention, I tell you, is kamma. Intending, one does kamma by way of body, speech, and intellect.
And what is the diversity in kamma? There is kamma to be experienced in hell, kamma to be experienced in the realm of common animals, kamma to be experienced in the realm of the hungry shades, kamma to be experienced in the human world, kamma to be experienced in the world of the devas. This is called the diversity in kamma.
In terms of explaining the eventuation/causation of the cessation of rebirth what is found in MN120 is perfectly aligned with what one finds in AN4.237:
“And what is kamma that is neither dark nor bright with neither dark nor bright result, leading to the ending of kamma?
Right view, right resolve, right speech, right action, right livelihood, right effort, right mindfulness, right concentration.
This is called kamma that is neither dark nor bright with neither dark nor bright result, leading to the ending of kamma.
(Sorry for repeating myself)