It's also possible that they simply went ahead and hit the vehicle, knowing there was a good chance that their target would be inside. It's not like they've been all that picky about collateral damage.

Why risk starting a war and not be 100% confident where the leader is?

Risk starting a war !!

That was the whole freaking point.

The attacking forces doesn't give a flying F about Iranians otherwise the sanctions would have been removed long ago on humanitarian reasons.

Most wars are started without targeting the leader at all.