Rozier has really impressed me this postseason. He's really stepped up his game after a disappointing regular season and has played smart ball with solid D. The kid also has ice in his veins.
All that being said, I think I'd still prefer Portis to Rozier due to our situation. I think if the players switched teams, Portis would've helped us out a lot more during the regular season due to our lack of solid bigs and rebounding, and I think Rozier would've excelled in Chicago without being behind both IT and Smart, let alone AB. And things will only get worse for him if we sign someone like Fultz.
We saw how bad Chicago's back-up guards were. I think Rozier would play a significant role off the bench for them. As for Portis, I think he would probably be in a KO-type bench role for us right now if he was here. He's largely been mis/underused there in Chicago.
Ultimately, depending on where our draft pick ends up and what we do in free agency, I could see Rozier as a significant, though certainly not main, piece in a Butler trade, especially with how high Chicago was on him in that draft.