User blog comment:Powerhouse411/Who Are Your Choices of Shichibukai?/@comment-24600241-20140206153231/@comment-4080028-20140207004001

Like with Kuroraka, I highly doubt Spike and Glory would accept the position of Warlord. First off, given the experience he's had with World Nobles and Marines throughout his life, Spike would outright refuse an invitation. Plus, that's taking the easy way out, which would bore Spike to tears. He's going after the One Piece because among other dangers, he actively wants the Marines and World Government on his spiky ass. Life's not worth living if you don't experience the possibility of death at least once a day. Finally, he knows full well how much Chris, Sakura and Lys hate the World Government, and while he doesn't care much for Lys, he'd willingly deny the chance to be a Warlord in order to continue supporting his friends.

Likewise, the same can be said for Glory. She doesn't have as many reasons to dislike the government as Spike does, but because the rest of the crew is supporting Chris, and especially because Spike dislikes the government and Marines, Glory would also refuse the invitation. I can see her saying right away:

Rose Glory: If Spike's not going, then neither am I!!

And then of course...

Jolly Pirates (except Sakura, Lys and Spike): YOU ONLY CARE ABOUT SPIKE!!

Or something like that. Though I do appreciate you considering them for the positions. ^_^

No Beard on the other hand, well, you hit the nail on the head. He'd jump at the chance to be a Warlord. Simply to help screw over the government from the inside out. Plus, it'd allow him to continue his activities without having the Marines or any bounty hunters chasing after him.