Tsuru's confidence seems to have risen quite a lot after equipping the new cannon. It's also clear that he is now rearing to go and fight as well. With the new cannon as part of his arsenal, he is now looking amazing and he is now not just some kind of useless-looking guy who carries a cannon attached to a ship.
"Wow, although I just switched to this cannon, I can tell that this is going to become one of the amazing weapons I might have equipped in the whole playthrough! I never thought you would just give this so casually! Are you sure I can just get this for free?"
"No worries. It's not that big of a problem anyways and I don't think you needed to pay much."
Although the effects of the cannon were quite big, the main reason it has good stats is due to how I forged it and my mastery of Blacksmithing.