You could still be wrong even if they all came from the same disk. The mass of the accretion disk has no bearing on the size of the planets formed, it could just as easily be a scattering of smaller planets. Given the gravitational churning of 3 (or two-and-a-half) stars, planetary formation was likely disrupted a great deal, so a large number of asteroids and dwarf planets might be the result.
Originally Posted by RalofTyr
STARGAZING: All I see are the lights of a billion places I'll never go. --Howard Tayler, Schlock Mercenary