User blog comment:AYET/Additional stuffs about chapter 711/@comment-8823907-20130613125800/@comment-8823907-20130615073037

Mythical that is true but Vegapunks experiment failed. It is possible that after the first failed DF the goverment told Vegapunk to focus on different matters like the project on making giants. Cesar could have picked up the research and  perfected it. This option would be possible due to cesars nature of wantng to prove himself superior to Vegapunk.