Yeah, your BB hating fanfic wasn't working that's why Hancock + Rayleigh was forced to give BB's stone men back. We know Hancock turned thousands of people into stone and none of them turned back unless Hancock wished it so, as well as Rayleigh wouldn't care about BB dying Rayleigh himself said he doesn't like BB, if they could beat BB there they wouldn't trust on making a deal with BB, there is no guarantee on what BB will do especially after turning his stone men to normal, it would be much better if Hancock turned BB stone as well as with Rayleigh's help, they could together capture him there. Rayleigh himself admitted they couldn't win at the end of the chapter, that proves Hancock + Rayleigh = BB minimum, they were lucky BB accepted the deal and take his men back.