"You're halfway there, aren't you?" A protest! If a joking one, though Tidus thinks it's fair.

Especially as Senku shares the power. Being really lucky is exactly like being really good! --if you want to make it argue in your favour, which Tidus does, thank you.

"See? Hey, you should try it sometime! Start thinking up stuff and see what sticks - maybe it needs a kickstar to get going."