Not to be difficult or anything, but stellar formation has never been seen, so the accretion disk is merely a hypothesis. :^)
My guess is, what we're seeing is the result of capture, and a binary star system would have a leg up on other systems to perform capture. OTOH, Jupiter's got loads of small moons, and many of them are in retrograde, considered diagnostic of capture.
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. ;-)