JJJ has an elite skill (defense) what elite skill does bagley have? It certainly isn't defense. The chance of him becoming an elite offensive player are slim to none also. The only players that are high impact game altering offensive players A. Create shots for themselves B. Create shots for others. B is out of the question, it's extremely rare for a big and Bagley has not shown the chops. As far as creating offense for himself, post offense is inefficient.
In fact, offense creation is the domain of wings and guards. Very, very few “bigs” can be high impact offensive game changers because they cannot create for themselves and they usually cannot create for others. There is historical proof of this.
—In NBA history having a Box Plus/Minus (OBPM) of +5 is the mark of an elite offensive player and +6 is the domain of the game changing offensive players. There have been 243 individual seasons in which a player has posted a Box +/- of +5 or higher and only 116 in which a player has had a +6 season.
—Here are all the non wings/guards to have a Box Plus/Minus season of +6 or higher
Barkley 4 times, Shaq 2, KAJ 1, KLove 1, DROB, Jokic, Karl Malone. That’s only 11 out of 116 times or about 9.5% of all such player seasons.
If you look at all the bigs who had a Box +/- of +5 or higher, you wind up with a total 32 out of 243 or about 13.2% of all such player seasons.
—Wings and guards have created the best offense (especially since 1980) but teams just didn’t know it. The highest all time OBPM for non wings and guards is Barkley at #13 and #21 all time. This was when he was in Philly and played like a big since he had far fewer assists than those at the top of this list. Kareem at #36 is the highest ranking traditional Big big.
The story is the same for offensive RPM.
2018: 16 players over +3 (Jokic and KAT the only bigs), 10 Over +4 (Jokic the only big), 5 Over +5 (ZERO bigs), 2 Over +6 (ZERO bigs).
2017: 24 players over +3, ( Blake, KAT, BOOGIE, Jokic), 14 over +4 (Jokic), 7 over +5 (ZERO bigs), 4 over +6 (ZERO bigs), 1 Over +7 (ZERO bigs)
2016: 16 players over +3 (Jokic), 9 over +4 (ZERO bigs), 7 over +5 (ZERO bigs), 4 over +6 (ZERO bigs), 2 over +7 (ZERO bigs)
2015: 22 players over +3 (LMA, AD), 13 over +4, (ZERO bigs), 5 over +6 (ZERO bigs), 3 over +7 (ZERO bigs). 1 Over +8 (ZERO bigs)
2014: 24 players over +3 (Ryno, Love, dirk, Frye), 13 over +4 (Dirk), 6 over +5 (ZERO bigs), 4 over +6 (ZERO bigs), 1 Over +8 (ZERO bigs)
ORPM TOTALS from 2014–2018: There’s never been a big with an ORPM over 5.
+3 ORPM: 92 player seasons overall, only 13 bigs (14.1%)
+4 ORPM: 59 player seasons overall, 3 bigs (5.1%)
+5 ORPM: 33 player seasons overall, ZERO bigs
+6 ORPM: 19 player seasons overall, ZERO bigs
+7 ORPM: 7 player seasons overall, ZERO bigs
+8: ORPM: 2 player seasons overall, ZERO bigs
A big HAS to become a defensive force to become a game changer because he won’t be on offense. A guy like KAT who can post (least useful in today’s game) and shoot like a guard (look at his %s on open threes) is going to cap out at a +4ish on offense unless he can create for others which seems unlikely. A guy like Jokic is a +4 to +5 Player on offense because of his passing ability. KAT isn’t a defensive anchor but is actually a liability relative to other centers. If KAT were a better defensive player, he’d be a top 3-5 player.