Forum:Luffy's overconfident...or not?

After reading the last chapter (696) i see luffy on the end saying : " I 'M GONNA DEFEAT ALL OF THEM" refering to the yonko. This could easily be credited to luffy's usual optimism, however i personally feel its something different. It's like hinting that luffy is more powerful than we may thought and we have yet to see the real fruits of his 2-year training. Want your opinions about the idea and whether you believe he is just babbling around or sth...