I think Ancelotti used the main lineup of Real Madrid. Most of the starting players are substituted players. Real Madrid has won the trophy of La Liga, Ancelotti didn't force his players to play all out. I think the main purpose of Ancelotti is to give more opportunity to play for substituted players and let the main players to take a rest for UCL final match. And Ancelotti tries to remind the players to keep their physical, they must avoid injured because there are still more important match. That's why Real Madrid looks not playing as strong as in the previous matches. If Ancelotti used the main lineup and ordered the players the play all out, Alexander Sørloth won't have a chance to score 3 goals.

Anyway, in most career of Alexander Sørloth, he is often playing as a loan player. He very often loaned by his team to another team to have an opportunity to play. I'm not sure to call Alexander Sørloth as a top striker if he only becomes a top scorer in this season only. He needs to prove it again in the next season.