[victory_angel]

Since they were using the TMNT origin from the IDW comics where the Turtles and Splinter start out as lab animals. But then when Splinter finds the book on ninjutsu he doesn’t exactly learn from it, but it helps jog the memory of a previous existence as Hamato Yoshi. And his sons also pick up these skills rather easily as well and maybe have hints such as maybe Mikey or someone off handedly mention having weird dreams or finding strange how they seemed to have mastered their skills so easily and how it feels like they’ve learned these skills before.