No, if words have sense, it can’t be said that a bonobo represents an absolute singularity compared to, say, a chimpanzee, a gorilla or a gibbon.
As for the absolute singularity of Homo sapiens, here are some quotes that nicely make the point:
“It is not that difficult to tell a human from an ape, after all. The human is the one walking, talking, sweating, praying, building, reading, trading, crying, dancing, writing, cooking, joking, working, decorating, shaving, driving a car, or playing football. Quite literally, from the top of our head (where the hair is continually growing, unlike gorillas) to the tips of our toes (the stoutest of which is non-opposable), one can tell the human part from the ape part quite readily if one knows what to look for. Our eye-whites, small canine teeth, evaporative heat loss, short arms and long legs, breast, knees, and of course, our cognitive communication abilities and the productive anatomies of our tongue and throat are all dead giveaways” Paleo-expert Jonathan Marks
“We are unique and alone now in the world. There is no other animal species that truly resembles our own. A physical and mental chasm separates us from all other living creatures. There is no bipedal mammal. No other mammal controls and uses fire, writes books, travels in space, paints portraits, or prays. This is not a question of degrees. It is all or nothing; there is no semi-bipedal animal, none that makes only small fires, writes only short sentences, builds only rudimentary spaceships, draws just a little bit, or prays just occasionally” Evolutionist Juan Arsuaga
“Man is a singular creature. He has a set of gifts which make him unique among the animals: so that, unlike them, he is not a figure in the landscape – he is a shaper of the landscape” Evolutionist Jacob Bronowski
“ Even allowing for the poor record we have of our close extinct kin, Homo sapiens appears as distinctive and unprecedented ….there is certainly no evidence to support the notion that we gradually became who we inherently are over an extended period, in either the physical or intellectual sense” Evolutionary paleo-expert Ian Tattersall.
Given the unprecedented singularity of man compared to animals (it is clear that mankind is transcendent above all other living things), John Sanford even argue (rightly IMO) that in a taxonomic sense mankind should most accurately be placed in a separate kingdom (i.e., plant kingdom, animal kingdom, human kingdom)