hm.... i kinda agreed with TheFlamingNeko, but is the 1st ninja is not nomicon. First: At the last episode, Randy said that : "we just ask the ninja nomikon" and he said " what is that?" so no, the 1st ninja is not nomicon. Second: i just think that some ninja named the book "nomicon" Or the third : it can be because randy said that the book name is nomicon, so yeah
after the season finale i think it is possible that first ninja could be the nomicon because randy said they talk the same and they have the same "no-nonsense" attitude when it comes to ninja stuff or its possible that the nomicon is simply alive from all the ninjas memories it got, it was shown that first ninjas memories were also absorbed into the nomicon from the "ultimate lesson" so maybe its a combination of all of the past ninjas?