Could the Celtics be competitive if they played two full five man line-ups 24 minutes each ? Basically: everyone on, everyone off? If so, they could do things like full court press, and everyone could stay in motion, because all of the players would be resting so much.
My ideas for the "two fives" are below:
Starting 5: IT4, Hayward, Jaylen Brown, Baynes, M. Morris.
(IT4 and Hayward carry the scoring load, and everyone else plays defence).
Second 5: Marc Smart, Tatum, Crowder, Horford, Theis
(Tatum and Horford play a pick and roll game, and everyone else plays defence)*
*I think Tatum is going to be a huge star, you'd have to adjust the line-ups if you didn't believe this.
Why don't teams try this? Everyone off - new five man team takes the floor.
Bench: Yabusele, Rozier, Zizic, Larkin.