In the case of G8 Zombie, it's a bit more tricky because many "Zombie control option", like TM manipulation, fracture, buff block whataver, will just result in Zombie death, meaning he will go a bit more often and taunt again if you ignore it.

Have you actually read Zombie's abilities? It revives at 25% TM, so killing it repeatedly is the best way to "control" it and prevent it from taking turns. But either way, the point is that it doesn't matter what happens with the Zombie, because it gaining taunt is really not the issue - if you don't have AOE then there's no way to finish the match because the Acolyte will always be stealthed unless you get lucky.

In fact, if the Zombie is geared up and harder to kill, then when it does eventually take a turn and gain taunt, then it's going to keep that taunt until you can dispel it with some ability, whereas if it's super squishy then all you have to do is kill it, which anyone on your team can do. Him dying over and over does not mean he'll go "a bit more often" because it will constantly reset him to 25% TM. Killing it is both the easiest way to get rid of taunt and prevent it from taking turns.