I'm not sure specifically which 'Cale Henituse stabbed' fanfics are the best. You could try searching on popular fanfic websites like Archive of Our Own. They have a large collection of fanfics and you might be able to find some that focus on this scenario by using relevant tags and keywords in the search bar.
Some writers might create a 'Cale Henituse stabbed' fanfic for the sake of drama. Stabbing is a very intense and life - threatening event, and it can add a lot of tension and conflict to the story.
The Saiki K manga ended. It wrapped up the storylines and gave a satisfying conclusion to the readers. Although it's over, it still holds a special place in the hearts of fans.