Weird stat you would figure is wrong but isn't:
Tatum has led the Celtics in scoring in 5 games this year.
Brown has done it 6 times.
How many of those games was Kyrie out?
Just today.
I mean, look at the games those were in, though. Brown's games are all largely blowouts, and he's been the focus of the offense later in the game and during garbage time when the starters are usually out or playing lower minutes. The only game that he led in that wasn't really a blowout was the San Antonio game, though he looked like the best player on the floor that night for sure.
Tatum's games have all been tight games except for opening night against the Sixers. (Notice that they're all at the beginning of the season, too, highlighting his offensive regression since then.)
I think that's a big reason for Brown having more games as the leading scorer.
Brown - @ Detroit +20; vs Chicago +29; @ Chicago +56; vs Milwaukee -17; @ San Antonio -9; vs Dallas +21
Tatum - vs Philadelphia +18; @ New York + 2; @ OKC +6; @ Portland -6; @ Dallas -9;