Will any Boston Celtics regress this season, and who are prime candidates?

The Celtics are the clear favorites to repeat next year and there isn't much reason to expect them to take any steps back, but is there a chance any of them will regress next year? If anyone does, who are the prime candidates? John Karalis of Boston Sports Journal and Tom Westerholm discuss guys like Jayson Tatum, Al Horford, Jrue Holiday, and Derrick White to look at what the odds are that a Celtic slides a little from last season.