For argument's sake, let us assume that this from the BBC is actually a good interpretation of what actually happened, and the whole thing is not false conclusions drawn on the basis of a carefully manipulated series of PR events. Maybe Zawahari was a fictitious character whom the Yanks photo-shopped into existence so that they could later claim credit for eliminating him with a non-existent weapon, what do we know?
The Zawahiri strike, he added, "sounds like a model application" of the [assassination] process. "It sounds like they were very careful and deliberate in this instance to find him in a location and at a time when they could hit just him and not harm any other person," Prof Banks said.
In the case of the Zawahiri strike, it has been suggested, but not confirmed, that the US also used a relatively unknown version of the Hellfire - the R9X - which deploys six blades to slice through targets using its kinetic energy.
In 2017, another al-Qaeda leader and one of Zawahiri's deputies, Abu Khayr al-Masri, was reportedly killed with an R9X Hellfire in Syria. Photos of his vehicle taken after the strike showed that the missile had cut a hole in the roof and shredded its occupants, but without signs of an explosion or any further destruction to the vehicle.
Here is a picture of said vehicle, from The Daily Mail, so that seems like a reasonable conclusion based on scanty evidence:
"... His family protested his innocence and said they were distraught. His wife was reported to be in pieces. Funnily enough, so was he."