Boston Celtics-Dallas Mavericks: Who do Luka Doncic & Kyrie Irving guard?

Part two of our crossover preview between Locked On Mavericks and Locked On Celtics focuses on Mavs questions, most importantly: Who do Luka Doncic and Kyrie Irving defend? John Karalis of Boston Sports Journal believes there's no good answers there, which gives the Celtics a significant advantage. Also, how does Nick Angstadt feel about Dereck Lively, a rookie, being such a key figure in this series? Can the Mavs bigs be everywhere they need to be?