You are the Rail Gun:
The only revived dead in RE and they were cut:
G-Zombies are formerly deceased humans revivified by the Golgotha Virus.[1][2][3] Though Golgotha is able to resuscitate dead humans, they do not experience the regenerative effects experienced by humans such as William Birkin and Curtis Miller, who were alive when infected. Consequently, they...
residentevil.fandom.com
The ones in CVX were shoveled into graves once they went catatonic according to canon to get rid of them but the bombings messed with the terrain. RE6 can be explained in similar ways as the graves weren´t even finished. Am I missing something else? I myself read primary sources that back up the claims on wikia that paraphrase: "
It should be noted that while zombification is known to result in brain damage and necrosis, the hosts are not, in fact, dead, as the t-Virus is incapable of reanimating dead tissue. Even with a shut down of the respiratory and cardiovascular systems, or apparent brain death, infected people do not die. Since some of the traits of zombies are the decomposed skin and the lack of pulse, they are often mistaken for reanimated corpses."
Something like the G-virus or C-virus will mutate the shit out of you to the point of unrecognizability but brain death or traumatic damage of major tissue is the end. That´s how we win these games. You could theoretically puppeteer a brain crushed Brad, Nemi can do this now, but the "child parasite" is the zombi´s motor there and that corpse would go to shit real quick too.