Guessing internally in Iran, the busiest thing these days is selecting a new Supreme Leader.

Everyone's not stupid; such precise strikes must be the result of internal infiltration. AI is just used to take the blame.
Those infiltrated by the US military, when the Supreme Leader is assassinated, must show extreme grief while hiding their own excitement; they must conceal the traces of the information they provide while rallying enough people to rise to power.
If infiltration occurs, then ensuring the absolute loyalty of the new leader becomes the most important. What would you do in this situation?
At this point, the legitimacy of blood relations and lineage comes into play.
Of course, US plans must also be considered — after all, they want regime change, and Trump always gets what he wants. If the regime is overthrown, the position of Supreme Leader will be gone.
Anyway, this is how I would bet.