I do not own One Piece!
Past Enies Lobby, so get away if you haven't read it! This is a theory about;
Subject: Young men's growth.
Source/Inspiration: When Coby shows up, the CobyMeppo part and A-chan's and mine imagination.
Theory: Okay, as you all has seen (if you haven't, you didn't read the fat text) Coby has grown real much since the last time we saw him. During the CobyMeppo part, he still was that little kid we got to know at the start of One Piece. So, what was it that gave him that sudden spurt in lenght and muscles?
Well, doesn't maturing in an emotional way show up on the outside? And Oda sensei has actually shown a true pairing in OP, involving Coby... For isn't the morfing of two names, like ZoSan, LuNa and UsoKa, a way to show a pair? Then isn't CobyMeppo a pairing supported in a way of Oda himself!?
Simply put, Coby grew as he discovered love with Helmeppo and trained under Garp so that he could fulfill his dream of becoming a strong Marine. It's also the reason to why Luffy seemed so grown up during the Enies Lobby arc, he was dead serious in his heart and filled with a will to rescue Robin. I do not ship that pairing, just points it out to give strenght to my statement. Which is purely crack XD
Review if you feel like it!