>I am so confused why Session recused himself
That's the easy part. Sessions was forced to recuse or face unprecedented accusations and investigations. He was weak knee-ed and buckled. Rr also appealed to his sense of right and wrong and made it seem like Sessions was somehow involved in the russian cover-up.
Why Mueller met with Potus day before is the biggy. Was it before Potus found out a SC was to be named? What is the exact timing of it all?
If Potus already knew about Mueller then Mueller and Rr told Potus the investigation was about him, only RUssian interference and possible campaign members involved. Knowing Potus, he would agree to investiagte anyone that did wrong. But they lied to him.
If Potus did not know at that time about the SCO, then Potus had asked them there to get their opinions on a new AG. That's my belief. Hopefully, we will all find out the truth someday.