Why are Apes so dominant?

I was watching the netflix documentery ANIMALS recently and in the section with chimps it said that, since they had moved into that area of jungle they had overhunted the local monkey population to very low numbers. Their hunts having an 80% hit rate far above that of lions and tigers, which we think of as apex predators. Great apes of all types use tools like stones for cracking nuts, probes for eating ants, nests to sleep in. This combined with the fact that were apes and we obviously dominate the world it seems to me that its not just us that are dominant but all apes. Am i correct in this observation and if so why is this the case?