User blog comment:Mizuki Raimon/What do you think they're gonna be doing 10 years later?/@comment-3153924-20110705090551/@comment-4091102-20110705140444

Another point that hints to Gouenji being Holy Emperor is that his 10 years later story is not going to be revealed in the spoilers that are given by watching the Strikers videos.

So his role must be important in GO.