Has Guitar Gone Mad?

I personally believe that Guitar has gone so crazy over the Seven Days and obsessed with getting the gold, that he has lost his sense of self. It has gotten to the point where Guitar tried to kill Milkman in order for him to receive all the gold and carry out his Seven Days mission. Guitar has lost his conscience because he obviously felt as though killing his best friend is the best solution to his problems, despite the entire message of the Seven Days is to kill a white in order to take a stand against black killings, but that time Guitar tried to kill an innocent man, Milkman. I am just astonished at Guitar's change in persona from the beginning when he was first induced into the Seven Days to his money crazed self. The point that put me over the edge was not the first time that Guitar tried to kill Milkman, but rather the second time. When Guitar accidentally killed Pilate, my entire perception of Guitar changed because he then had not tried to take one innocent life, but took one and was plotting another. Looking back at the novel, I cannot find hints that would point to this happening, I guess thats what Ms. Maxey meant when she said there was going to be a twist to the end of the novel!