The current odds could confirm that, we can check it out below.
https://www.foxsports.com/stories/nba/finals-eastern-conference-western-conference-mvp
NBA Finals MVP:
Jaylen Brown, Celtics: -280 (bet $10 to win $13.57 total)
Jayson Tatum, Celtics: +250 (bet $10 to win $35 total)
Luka Doncic, Mavericks: +2200 (bet $10 to win $230 total)
Jrue Holiday, Celtics: +7500 (bet $10 to win $760 total)
Not even close though, and I think Tatum already knows that but it should be fine with him as finally they will get a championship at their young age. Maybe that will be the target next time, but getting a championship is more fulfilling that an individual award.