No, quite often the victims were bludgeoned to death just like this poor family.
For example, among others, Guy Heinz Jr. murdered 8 members of his own family all in one home. Most victims were adults. He also bludgeoned a 3 year old little girl during the same multiple mass murder, but miraculously she lived, although suffers from some disabilities from the brain damage she suffered.
The WDC mass murderer of the SS family, and their maid, he did not shoot any of his 4 victims. Neither did Richard Speck when he murdered 8. Etc.
If you do a Google search there are a multitude of mass murder cases, which several have been on WS over the years, proving only one perpetrator carried out the entire thing, from murdering them all, all of the aftermath, and cover up afterwards.
There is nothing showing he needed or had help, and that is why after a lengthy investigation before his arrest, he is the only one that will ever be charged. LE goes strictly by the evidence they collect and what it tells them. Assumptions, and speculations arent evidence they can use.
AND, he may have used trash bags to cover their heads, first.
I respectfully disagree about murder being murder, the weapon of choice CM used against all of them, including two small little boys is far from being...murder is murder.
Imo, It gives us a glimpse into his demonic mind, and what he is really capable of doing to others when crossed because even most murderers dont crush the skulls of children by using a sledgehammer especially since these little boys weren't even in his own family.
Imo