It was a hypothetical based on the assumption that Greyworm insists on Jon's death. I am not arguing that it is likely. I am discussing a hypothetical based off of Knight's post.
It is pointless to argue over how likely it is as this is pure speculation. I am saying assuming war breaks out, how do we think it plays out? It is fine if you don't want to engage in this hypothetical but arguing about whether it is likely or not is pointless as no one said it was.
So IF war broke out over Jon, what would happen? The North is claiming independence so siding with them is siding with an independent Kingdom. Yarra wanted independence and wants Jon punished so what are the Iron Islands going to do? Dorne was the one Kingdom that had the most autonomy and still allowed their leaders to be called Prince (not Lord) so where do their loyalties lie? Gendry obviously loves Arya but she rejected him and Dany gave him his title so what would he do? And so on and so forth.