What about my second comment. Odd orbits in general would seem to me to be indicative of capture.
On 1st, Jupiter would have had to be about 80 times more massive to ignite and make us a binary. For that to happen the HYPOTHETICAL accretion disk would have had to have lots more mass. More mass would lead to more gas giants. I would think capture would not account for all the exoplanets in those systems, rather it is a function of more mass. HYPOTHETICALLY of course. ;-)
I got that -- capture is more likely as the explanation for a system that appears to be this wacky; it's probably somewhat more commonplace than generally accepted for two stars to collide, and their planetary systems shake out however they do; and when a star goes kablooey, its perfectly possible that its former planets wander off into the sealanes as it were; however, until we can actually *go* to other star systems in a reasonable time frame, we're relying on a data set that, while ever-improving, will still be skewed toward systems that appear peculiar to us. This skew is another good reason to use the pages of "Rare Earth" for 'recycling' in the outhouse up at the cottage.