To me, it all comes down to Jaylen Brown. Jrue is a legit All-world defender, and he is spending most of his time on Tatum (and their team scheme is designed to limit Tatum). Jaylen should be able to feast on whoever his matchup is - getting to the rim, mid-range, not to mention the bunch of open looks from 3 he couldn't make yesterday,
If that was just a terrible game, then I am confident he will bounce back and start to dominate his matchups (which we need to beat the Bucks). If he was that bad due to his hamstring not being right, then I'm seriously concerned.