Hey. First of all, hail to the old gurad of this forum (you know who you are, lads :) )
I was bored, and was writin down the crew member names in my PC. And I thought, "OK, let's play a little, man".
So we have,
Luffy
Zoro
Nami
Usopp
Sanji
Chopper
Robin
7 members total. So, if we count the letters in each name, we have, 5 for Luffy, 4 for Zoro, 4 for Nami, 5 for Usopp, 5 for Sanji, 7 for Chopper and 5 for Robin. So we see that the numbers that all "play around" are 4, 5 and 7. Even Vivi's name (who was a nakama for a while) is 4.
And now we have Paulie and Frankie, and we wonder who will join. Paulie has 6 letters, while Frankie has 7! Can it be possible that Oda has some kinda number code or somethin, and so the names match with each other this way? So maybe this way we already know that Frankie (who's 7 like Chopper) will join, cause Paulie is 6 and no one else is 6. Dunno. Just random buullshit from my mind. Feel free to comment however you like (even curse, yeah) and add anythin.