I think the explosives expert turned himself in already.

http://www.ibtimes.co.uk/paris-attacks-isis-bomb-maker-mohammed-khoualed-hands-himself-police-1529599

The suspected explosives expert behind the Paris attacks has handed himself in to police, it has been reported. Mohammed Khoualed, who is from Roubaix in northern France, is thought to have assembled the explosives and detonators in the suicide vests, used by the terrorists, who killed 129 people in Paris on Friday 13 November.

judging by the star-shaped marks on the outer walls of the apartment.

if something that is supposed to go threw several inches of steel cant pentetrate that wall.

just minor surface pitting from the round case.

most of the energy is directed with the penetrating jet, usually Copper.

We did a test with an RPG-7 against an Aluminum-bodied step-van. The blast cut a ragged 100 or so mm hole in the Aluminum, jet didn't even bend the metal. the blast pattern to the side looked much like the damage to the walls. It consisted of tiny fragments of alloy from the RPG body striking the surface with very little penetration.
These type of weapons are effective in penetrating Masonry walls to hit shooters hiding behind, as well as penetrating Steel.

?

I was standing about 3 feet to the right of the shooter.

"pieces of third body found..."

or dental work. Yeech