If IT remains in the starting lineup, look for teams to exploit his weakness on defense more and more.
Posting him up, rubbing him off of picks. They're playing him much more physically, reaching in, bumping him off track. They're closing down the lane as he tries to get to the rim, daring him to pass out to open men.
Thomas, being a volume scorer, needs to better pick his moments of attack, and hit the open man more often. Spacing, when he's in the game has really deteriorated.