There are 9 Vice Admirals. Luffy has 9 crewmates. Many think Kizaru is going to fight Luffy while the other Strawhats fight the VCs. Some think Luffy is going up against Saturn and Zoro fights Kizaru. In that case one VC would be left without SH opponent. If Bonney is the next SH (Hancock is more likely, but Bonney is a popular pick) she should fight a VC, just like Franky fought a CP9 agent before he joined.
