The top two are of the Quali list are always in by right, unless there are any SEs. No need for withdrawals. There are 20 places in the draw as of right. So the 18 for the direct list and the next 2 if no SEs.
That might indeed be all it is, the two possible SEs not being taken up. The third on the qualifying list, Kozyukov, is in qualifying as q2 seed.