My first thought, almost immediately, is whether or not the eleven bodies share memories. Like, if Number 1 reads a book, will Number Two have the knowledge of the plot appear in his mind. This is important, because to me, although there is only one chapter thus far, it seems as if all of the bodies are training in everything. If they all train in everything, then the main character shouldn't be suddenly seeing so much success because it'd still be limited by his potential. Thus, having certain bodies specialize in a task or two would be vastly more efficient, but like I said, it looks like they train in every subject. Will need to read more to know for certain the rules and limitations.