It seems very likely that the intelligence breach came from Iran's side or at least that they have serious problems with infiltration both of the human assets kind and the electronic hacking kind.
It's also worrying if this is true that Hezbollah lacked any kind of sufficiently deep and fortified command bunker to withstand the blast of a single bunker buster munition or that he wasn't moved to it.
I'm not convinced that in a full war that the zionists wouldn't be able to just shut down Iran's command and control and leave them pretty uncoordinated before a coordinated US-zionist assault. They wouldn't be able to knock them out in one blow but they could put them on enough of a back-foot that they'd be in a awful position to attempt to fight back against air power and lose air supremacy in their own country meaning the US and the zionists would just permanently occupy their skies and blow up anything military looking from the air without even needing to put boots on the ground. It could take Iran out of the picture as a regional power and plunge their people into economic misery for a decade easily. This could allow a US regime change attempt as they're the final domino in controlling the middle east and there's already a lot of discontent among the people there after so many years under sanctions.
Fact is the zionists regularly killed Iranian nuclear scientists in drive-by shootings so internal security in Iran is not that tight. Add to it the fact they planted a bomb in a safe house to kill the lead Hamas negotiator and they've compromised them pretty badly.