Why did Splinter choose these weapons for his sons and what did he see in them? Ninja Turtles Theory

Just a little theory of mine on how Turtles get their weapons and why, as I watched the show I slowly realized that their weapons do not match their personalities at all and I started seeing a pattern in what was the teaching and what was their innate ability and where the balance was. This gave the show more depth, at least for me. Hope you like it.