Brad Stevens hasn't really messed with players around Sharpe's level much.
All his acquisitions are either for really good players (Brogdon, Porzingis, White, Holiday, Horford, Gallinari) or for upside-end-of-the-bench players (Queta, Kornet, Minott, Brissett, Craig), or as a salary move (Bol, Simons, Niang etc.).
The one exception I can think of was Tillman, who was roughly the same quality of player as Sharpe when they traded for him.
It's far more likely that he's going to get a higher quality rotation player, rather than a player that would ideally be a 3rd string center on a true contender.