Gafford/Lively were able to have a lot of success vs Minnesota because Gobert was no threat to pull them out of the paint. Same with Zubic when they played the clippers.
Holmgren went for 19, 11, 13, 18, 13 and 21 in the games vs Dallas. Of the bigs they played, Holmgren and Naz Reid would be the ones that were willing to take the outside shot. I would say KP and Al are much better shooters from 3 than Holmgren is. This will be the toughest test the Dallas bigs have faces.
If Gafford or Lively play the 3 point shooting bigs of boston by coming out that leaves the lane open. My guess is they give the 3 point shot up to AL and KP and role the dice.