Its like Littlefinger had this really long con planned and then everything got turned upside down because of one person: Cersei. She has inadvertently been involved in all the shenanigans that have sped up Littlefinger's power grab with all of her dumbass moves.
She got caught boning Jaime which led to him tossing Bran off the tower.
She orchestrated Robert's death.
She started the "Tyrion killed Joffrey" accusations.
Littlefinger has just been taking advantage of Cersei's being a dumbass.
That's a good way to look at it. Littlefinger sets up scenarios where Cersei will become more powerful because he knows she'll fukk it up and open a door for him.
![ehh :ehh: :ehh:](https://www.thecoli.com/styles/default/xenforo/smilies/ehh3.png)