@MetaMario:
It's all part of the tension. BB has been getting a lot more threatening to the world as the story has progressed. We've seen a glimpse of him from a Den Den Mushi on Dressrosa (IIRC) so I think Oda would want to wait to show him off until the moment is just right.
So we hear him and his crew doing these things and we go "oh crap, this guy's a monster…." Adds to the thrill.
from the den den mushi the main changes seem to be a pirate hat with his pirate logo and a longer black beard.
@KageKageKing:
He is going back to Boin Archipelago and the places Kuma send they were all random. I see no reason for him tossing Luffy for example in an island ruled by a warlord that hates men.
He is more likely a hostage.
BB isn't producing weapons and is not involved it. He just got into this recently when Burguess got in Baltigo.
They were not random kuma sent perona to the place she described to him when he asked where she wanted to go and even looked at his book for directions to it he would have known where to send all the straw hats by seeing them fight moriah he watched the fight then had time after to pick where to send them since at least a few days passed before he met them on sa again also without hancock luffy would not have gotten into impel down alive.
Zoro sent to the best swordman in the worlds island to train
Luffy was sent to a island full of people that knew haki he needed haki training
nami sent to a place for navigation
brook sent to a place to get better at music
franky sent to vegapunks island
chopper sent to a place full of medical knowledge since he is a doctor
usopp sent to a island full of dangerous stuff to get stronger and become braver plus he upgraded his weapon and the stuff he shoots from it there.
sanji sent to a island full of recipes and it was allied to the revolutionary army not random.
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@Razh:
It wasn't random. Nearly all of them landed in places that allow them to improve the skill they specialize with. It was more like "if there's no perfect training place available, choose the next best thing".
Exactly all the straw hats got stronger or developed their role on the ship better from were they were sent