I think there was an intelligence failure involved. I don't know what Mossad thinks, but ordinary Zionists and Israelis I know believe strongly in an imminent Pahlavi takeover. Israel deployed 700+ domestic agents to decapitate the regime, who were mostly caught in flagrante delicto.
October 7th was an intelligence failure. Not really seeing that this time. I suspect both would *prefer* to call a halt now and that both are *capable* of sustaining the war indefinitely, but I’m not seeing that as indicative of who has ‘won’, nor any sign that US involvement has had an impact
Israel has killed a fair number of pretty senior Iranian officials at the cost of rallying Iranians to the flag (& done negligible damage to the nuclear programme). Against which Iran has killed an few Israeli civilians, using relatively expensive weaponry (Correlli Barnett would not be impressed).