Not sure how any of that works. I was always in bands that knew what song was coming next, and what key they were in.
ditto.................
as musical director playing keyboards on tour years ago with show bands during sound check & rehearsals,I would always single out each player randomly to play their part solo to see if they were holding their own as a slacker could ruin a show,....everyone had to pull their weight always or your gone. Simple as that.