i think it was michael who met lucifer bc michael wiped out his memories about shahar, unlike lucifer who still know about it. thats why he gave him hints of “that person is living well” and michael is in another body since he isn’t like lucifer who probably eat or the soul vanished on its own.
If that is true, I wonder why he would change bodies then if he doesn't remember?
just my theory since they don’t explicitly show but they did mention, whenever they ascend to earth they will use vessel body in order not to reveal their true form. thats why they were shocked when they saw benny/shahar in his true form since he is ascended to earth and no longer as an angel.
and the fact that he is no longer an angel, he is obliged to forget about heaven. but, he wanted to keep them and since michael adores him so much he is the one willingly to forget about him.
so i assumed, michael went back to heaven to do the forgetting memories stuff n so on, and ascended back to earth just to meet lucifer, which i also assume he is using another vessel body.
So at the end ch.15.5 , it looked like Turner met up with Lucifer but was that person actually Turner or someone who looks like him?
I know Lucifer made a “deal” with Turner to take his soul for saving Benny but then Michael asked about it and Lucifer said he would think it was sus if he saved him without asking for anything. So, I don't know if that was something he followed up on later or if it has anything to do with my previous paragraph.