If the top kill is performed then I believe the answer is there is no need for the bottom kill to pump mud any further then where it encounters the intercept point in the main well, which then obviously would be filled with cmt at that point. In other words. Just fill in the relieve well bore with mud ...go through the motions of then extracting the mud and filling the casements, RW bore with cmt.
Kent Wells July 21st Technical Update
But then I read on the Oil Drum that the procedure would be reversed. First relief then top ?