Board Thread:Questions and Answers/@comment-13442349-20130726072748/@comment-11051098-20131104103107

Seeing as Harribel and Grimmjow are the only 2 left from the Espada, excluding Nel, they could technically be Espada #1 and #2. But they probably don't see themselves as Espada anymore.

Grimmjow seemed like he never really liked or cared about Aizen, and Harribel was cut down by him despite showing him loyalty, so that loyalty is probably long gone.