Bad Astronomer says this is purely coincidence that this event occurred so close in time to the passing of 2102 DA14. I don't really like pure coincidence when dealing with astronomical scales. They tend to turn out not to be so purely coincidental.
Don't read me wrong. I don't go for conspiracy/wacko theories either. I just think it's way to early to write off as coincidence without further analysis.
You and me both. My first thought was that this thing is/was a chunk of DA14 or maybe a tag along.