One critique of your analysis. I dont think the 2 week timeline is because thats how long itll take America to prepare. Theyd probably need much longer to prepare fully. The 2 week timeline is because Israel will run out of interceptors in 2 weeks i think. Thats how long they think Israel will last without US intervention.
I am also not fully convinced the US will go into this war. I think they are being warned off it behind the scenes by China and Russia and know it will be a prolonged proxy conflict at the least. We will see what they decide to do. Id say its 70% chance the US attacks Iran but theres still a chance they decide its too costly and back off at the last second too.