Fixing the Detroit Pistons' roster: The centers
The first thing I would do is move Isaiah Stewart to an all-purpose big man spot off the bench. I don't think he's the problem at power forward, but they need someone who can consistently provide offense.
The ideal role for Stewart is as a do-it-all big off the bench, as he can play center in smaller lineups to get more shooting on the floor or with another big at times when they want to put a bigger lineup out there.
The Pistons have long lacked a veteran who can actually play or a big who can stretch the floor. Moritz Wagner would be great but he has a team option that Orlando will almost certainly exercise. There are some veterans like Daniel Thies, Mason Plumlee, Kevin Love or even Andre Drummond who could fill the veteran role Detroit has lacked.
So what would the final roster look like if everything went to plan?