I was looking for something else and found these:
@Zik:
The last unknown shichibukai is a D., I think Jaguar D. _____, he is technically a giant but is the size of a regular human(he just has the life span of a giant). He's 20 years old and has mastered Life Return so he can make himself appear as a 10 year old kid. He will be the 10th and final nakama of the SHs. SO yea the SHS will get a 2nd D. in their crew and at the same time a shichi.
This is a random theory/speculation.
Talk about wrong. I been holding out on the giant that's human sized idea for a while. That life return talk is basically what Bonney's DF turned out to be.
@Zik:
Margaret will join, when the crew gets back to SA there'll be another arc where a fishman joins (he'll have something to do with Jimbei in some way whether he use to be in his crew or has a grudge against him). Crew complete on to the NW
Hope I'm half right.
@Zik:
Both WB and Luffy will fail and Ace will die. BB will be the one to kill him. Wb will push himself to far and be extremely weakened after the war, susceptible for anyone to take him down.
Hancock will die protecting Luffy after realizing they could never be together since if she were to go off with him her island would be destroyed by the WG and she doesn't want to abandon her ppl but since she doesn't want to give up Luffy death is her only solution. Ofcourse Luffy will be completely oblivious to her love for him until she says it and he'll be really confused yet sad anyway since she died protecting him. The person who will kill her will be Admiral Akainu. The new empress of Amazon Lily will be Nyon for the time being.
2009 in OP will be the year of death.
Wrong but still a great theory in my eyes.