What is going on with the DBacks announcers.

Seems like the past couple of weeks the DBacks are playing revolving announcers first Grace was missing for some game and Candy man filled in now Sutton is missing. I am not a big fan of Sutton but would like continuity in the announcers. I would like to see tonight's announcers be full time. Heard the rumor the Sutton was talking to the Dodgers I don't think that he would be that stupid to talk to a different team.