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Nearby Star Is Sun's Long-Lost Sibling (syfy.com)
The Bad Astronomer writes: A nearby star, HD 186302, was almost certainly born from the same cloud of gas the Sun was 4.6 billion years ago. Astronomers have found it has an almost identical chemical composition as the Sun, is on a similar orbit around the Milky Way, and has the same age (within uncertainties). Interestingly, it's only 184 light years away, implying statistically many more such stars are waiting to be discovered.
Perhaps, but not necessarily. In 4.5 billion years since its formation, the Sun and the solar system have gone round the Galaxy many times. There has been plenty of time for the stars formed at the same time and place to drift apart.
About 19 times, if you want to call that "many". Your actual point remains valid though, 4.6 billion years is plenty of time to drift a couple hundred light years.
As opposed to ugly unique? Normally, "unique" does not require modifiers other than "nearly" - "nearly unique" might make sense. But not "pretty unique".
Also, are you using a sample size of one solar system for your "pretty unique" analysis? If you are, you might want to consider the evidence that Mars had liquid water (and may still, underground), and several moons have liquid water under the surface. Hardly unique, even in this solar system....
"I do not agree with what you say, but I will defend to the death your right to say it"
TL;DR
Space is big. Really big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist, but that's just peanuts to space. - Douglas Adams, The Hitchhiker's Guide to the Galaxy.
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