a few things,
first a bobcat cpu with no gpu does not sound like something we would see in consumer products like netbooks, it has to get a gpu from somewhere else, so why get a single core, power sucking chip, in a devise that runs on a battery. sounds like they have a special purpose that we wouldnt see in conventional forms.

second, a single core with gpu is 9W, a duel core with gpu is also 9W, the difference is a 200mhz drop to add that second cpu. sounds like its pretty low power to me. the fact everything is 5 or 9 or 18 watts makes it really tough to infer any exact power consumption per core.

and last, the comparison between atom and ontario tdp is just laughable. same power, worse gpu, and a slightly higher cpu speed with a much weaker ipc, sounds pretty sexy to me, lol