He leaves an enemy alive as strong as Sasaki which he somewho will free himself and become nuisance. Isn't Oda familiar with the phrase " Cut the grass and clear the roots".There are many times that I feel Oda creates forced plots without any reason and rhyme. Many say is that isnt Oda's style to kill such strong characters too early without seeing them in action...Well then,why does he introduce them so early... I have seen similar situations before such as the appearance of the admirals when the straw hats were weak ( which doesn't make sense to put such an importance to a weak group) or the fight with crocodile (which doesn't make sense that luffy beat him )...I am sure that are many more that I dont remember.Although those two examples are little way off but again you know what I mean.We have seen many times enemies beaten and then reappearing (the other way is also true). I feel like the plot is kinda forced...it is tiring and makes no sense..