If we take the fact that prior to the swap, the F used 14 R46 trains, and the R used 31, and the N/W collectively used 29 R160 trains, while the Q used 21, there are clearly enough R46 trains to cover all of the N/W's R160s as well as the entirety of the G (though the G may be keeping its R68s), still having a considerable amount of trains left over for use by the B/Q... However, I'm still not sure how car assignments will fully play out, we'll have to wait and see for ourselves.