JB has seen his usage skyrocket this year, by around 25%. Despite that, his shooting efficiency has increased, which is pretty surprising. Further, his TS% is better than the players he is most likely taking shots away from (Simons, White, Pritchard, and Hauser). When Tatum comes back presumably Jaylen will be able to step back at times, and hopefully those possessions where he steps back are the ones where he is less likely to score.
But JB has unequivocally shown he can carry an offense, and he will only benefit when the burden is lightened a little with Tatum?s return.