Mike will definitely be there for vampire lessons because he knows vampires but first hand teaching beats that. He'll take notes and flirt with teacher in front of his son. It's a rite of passage.

Yes. Mac helping Luci and Max. Def. White Rabbit and Mac with the mistaken identity attacks.

And Lucifer will help Saya and convince her to let him take her to the Fairy Queen for treatment to get the corruption removed.