Thibaut Courtois and Vinicius Junior were indeed starred in the Champions League Final, but the one who plays an important role behind Real Madrid's glorious achievements this season is Carlo Ancelotti. When Real Madrid decided to sign Carlo Ancelotti, many people had their doubts, moreover, he also didn't take many actions in the transfer window. But those doubts were answered, and in the end, he managed to win La Liga and the Champions League trophy with a squad that doesn't spend a lot of money.
Thibaut Courtois was probably the most important player for Real Madrid. Without him, I don't see how they would have won the Champions League trophy.
Another thing is Real Madrid realized that with the kind of defense that they have they will not be able to stop Liverpool without dropping back a lot more players than normal to defend.
I really praise the coach for that. Even I had doubts about Real Madrid but they have played really well and they absolutely deserved the success that they got both in la Liga and Champions League.
Regards
Duke