User blog comment:DonyarktheKungFuMinion/Old Man McGucket: Crazy or Smart?/@comment-11894493-20130724194433

I think that Old Man McGucket wrote 3 or he wrote all of them (that's still a possibility) and then maybe he showed his findings to the people of Gravity Falls and they mocked him or whatever, and called him crazy, so he hid 3 and pretended to be crazy this whole time so in case anyone found the book he would not be suspected in writing 3.