Why? Do you expect them to vote to hear the case?
This is not a majority vote. The case is taken up by the entire court if four justices vote to hear it. Five justices can vote against it but as long as the other 4 vote for it then it advances. Kagan and Sotomayor voting or not voting, that doesn't change.
Perhaps I have the proverbial cart before the horse... would a recusal come before a vote to grant certiorari? If so, and it’s a big if so, does the majority threshold remain at 4, even though there are now just 5 Justices voting? Or does the majority shift to 3?