Been thinking about this a lot... and Brooke already has significant importance. The main heat between Hogan and Bully comes from A) the title, and B) Brooke. But you already know this.
Every heel turn in this storyline has had some kind of logical premise, they've all been wronged by Hogan. What would Brooke's excuse be? "Oh, I don't want to be in your shadow any more"? Her love for Bully? Lame. She's doing a lot more for this being torn down and ripped apart (hilariously) by Bully than she would as part of the Aces, that's for damn sure.
Lol logical thinking ^