It's math. Two points make a line. Three points make a line or an arc or a triangle.
An arc looks like a half circle sorta.
starts from zero on the x axis with an origin, rises on the y axis with development, falls on y axis and then heads back towards zero on the x axis because of firther development that has fundamentally changed the status quo of the story and is heading towards a conclusion which is again zero on the x axis.
Like a ball in flight.
I ('m sure? I) said changing the acting, is cheating, but bringing a character back from cold storage means that a story line is getting curvature even if it is cheating.
How hard is it to get an actor to accept 10 grand for a couple hours work, and then come back every now and then for another ten grand?