Well, that seems to make 2 major assumptions (and several minor ones), both of which are probably false: * that the planetesimals that formed Earth had the sam

Well, that seems to make 2 major assumptions (and several minor ones), both of which are probably false: * that the planetesimals that formed Earth had the same orbital characteristics (notably eccentricity), rather than being averaged out. * that planetesimals formed from dust in largely the same manner as planets form from planetesimals