There is a strong risk that the new male will kill the infants of the dead silverback.
Such conflicts are frequently quite violent and males may kill each other in battle.
These males only kill infants that are not their own.
And not only the males, but their attendants are dead too, killed the same way.
Immigrating males often kill young infants when they take over a group.
The male can kill or eat the female if it stays close.
The Gods only made three of them, and the two males killed each other during the first mating season.
It will be interesting to see how the males kill them.
A third reason is sexual selection, where males kill unrelated offspring.
By doing this, the male is killing any possible competition.