I didn't see the game, only going on the box score, the the key line up was Schroder, Smart, Richardson, Tatum, and RWilliams. That unit was +14 in 11.3 minutes. This was clearly the difference in the game.
Toronto doesn't have any real skilled bigs (other than Siakam) so our 1-big line up was able to take advantage. Williams in particular played his best (in terms of +/-) with that unit. Horford was -6 overall in 24 minutes. He was -3 in 17 min as the second big and -3 in 7 minutes as the only big. Good night to play Horford a little less I guess.
For Toronto, they were at their best when Siakam was on the court. -3 with him on (30 min), -13 with him off (18 min).