We see that in order for Kakuzu to cast his Diamond Morph technique, he only needs to do the hand seals once. He does not need to maintain the seals in order to maintain the technique.
This creates an interesting possibility. Kakuzu can take anything, cast his Diamond Morph over it and instantly have a diamond hard tool to use as he wishes. With Earth Style, he could shape the ground into anything, from a spear to a sword to a fan and whatever else may be suitable for the moment, and then harden it into a weapon that is both practically unbeatable and always remakable.
With this, is Kakuzu not only the best treasurer of money but also weapons?
This creates an interesting possibility. Kakuzu can take anything, cast his Diamond Morph over it and instantly have a diamond hard tool to use as he wishes. With Earth Style, he could shape the ground into anything, from a spear to a sword to a fan and whatever else may be suitable for the moment, and then harden it into a weapon that is both practically unbeatable and always remakable.
With this, is Kakuzu not only the best treasurer of money but also weapons?