Rozier is the obvious choice, and yet not one of your options.
I like your pick, still, a tough road game, a kind of those where experience matters. At least to open the things up in a brighter light. While we won both of the games we started poorly, I would try to avoid it for the 3rd time in a row. I might go with Marcus, but gut feeling is TR.
We started poorly because in both games we had IT guarding Wall in the beginning of the game. Rozier made Wall work a lot harder when they were matched up. Also, Terry's a terrific defensive rebounder, which is obviously a problem for us, especially early on in games.
That's way too small to start for me. I think if you started that small, then you actually help Brooks out by forcing him to utilize their guards' size in the post, which was very successful at the start of last game.
Inexplicably, though, Brooks went away from it after picking up two quick fouls on IT and exposing us with the pass after double-teaming to help IT. But if you give Brooks three major size advantages on the perimeter, let alone Morris over Crowder, that's going to be extremely difficult to guard if they play that hand, which they absolutely should if we go that route.
I think you start Brown for his size. He's played really well this series on the quicker guards, and I think that maximizes him as a player while still allowing that trio of IT, Rozier, and Smart to continue to feast on their bench at the beginning of the second/fourth quarter.