Mbappe was too selfish with the ball today, and that almost made a fun of him because he always get frustrated whenever he is dispossessed trying to pass through the middle of 3 or 4 players of Osasuna. He got frustrated after Vini scored his hat-trick, and passed him with one goal, whereas he has been stucked on six goals for some weeks now. Vinicius is the MVP of the match because he opened the scoreline and ended it. Out of Real Madrid last six goals, Vinicius scored five out of six in three consecutive matches.
Vinicius shows that in Real Madrid, he and Mbappe will continue their internal race for a position as a most important attacking player, a most brightest star player in Bernabeu. Mbappe actually feels that in Real Madrid, he won't automatically become a brightest star player if he can not play better than Vinicius.
In quality, they are at a same page and in experience in Real Madrid and La Liga, Vinicius has more experience than Mbappe who is struggling with his striker position in a new club and also a new league. In addition, what's going on with Mbpape and his national team France, probably affects his mentality in general, then his performances for Real Madrid too.