I hate to say this, but Tatum doesn't look very good.
He just can't get his scoring game going right now unless he gets downhill at the rim, but he's still hunting that jumpshot instead - partly because we're running him at the 3 with Bam and AD clogging the paint. With the Celtics, he made up for his inefficiency by being the engine of the offense and creating for guys, and his size and rebounding presence were a major plus as well for a team whose bigs are mediocre rebounders. But this Olympic team doesn't need those things from him. So he's kinda drifting with no clear role.
By contrast, Jrue is just doing the Jrue things that he always does and he looks much better for this squad.