Analysis: Zeller ended up getting lost in the shuffle last season due to the Celtics' glut of big men, so it wasn't expected that he'd be retained heading into the offseason. However, with Jared Sullinger leaving for the Raptors and Kelly Olynyk (shoulder) unlikely to be ready for the start of the 2016-17 season, Zeller will provide some veteran insurance in the frontcourt. Zeller averaged 6.1 points and 3.0 rebounds in 11.8 minutes per game over 60 appearances last season, and while he could see those figures spike while Olynyk is out, the big man will likely get buried on the depth chart when the roster returns to full strength.
Analysis: Crowder sprained the ankle in the second half of the regular season and saw his production decline upon returning to the lineup in late March. Though offseason surgery wasn't deemed necessary, the pain lingered for nearly two months after the Celtics were eliminated from the playoffs, showing a true toughness from the 26-year-old forward for being able to play through the issue for so long. Now that he's pain free, Crowder will be healthy heading into training camp and will look to build on what still ended up being a career-best campaign. He averaged 14.2 points, 5.1 rebounds, 1.8 assists and 1.7 steals across 31.6 minutes per game in his 73 appearances.
Analysis: While Young was playing in his third summer league, he was still the third-youngest player on the Celtics' roster. As such, the former blue-chip recruit remains an intriguing project, but he hasn't made tangible strides since entering the league in 2014, having played in just 60 NBA games. The 20-year-old's effort was reportedly questioned by an assistant coach in Las Vegas, which certainly doesn't bode well for his chance of cracking the rotation, let alone the roster, in 2016-17. Given the Celtics' considerable backcourt depth, Young's time to prove his long-term worth may be running short.
Analysis: Rozier didn't make much of an impact for the Celtics as a rookie, but he'll look to step into a slightly larger role this season as the projected third point guard behind Isaiah Thomas and Marcus Smart. In Las Vegas, Rozier shot an impressive 54.2 percent from the floor and 45.2 percent from three-point range, helping to quell concerns about his shaky jump shot. Of course, a six-game summer league sample is far from definitive, but the Celtics still had to be encouraged by the 22-year-old's showing.
Analysis: The second-yer big man out of LSU was rather inconsistent in Vegas, but he turned in a pair of double-figure scoring performances, including a 12-point, 13-rebound outing in the Celtics' final game, a loss to the Trail Blazers. As always, it's difficult to discern the true value of summer league showings, and Mickey remains on the outside looking in at consistent minutes in 2016-17.
Analysis: Hunter played only sparingly for the Celtics as a rookie and he'll look to make a leap in his sophomore season, though the roster isn't exactly full of holes. The Georgia State product is slated to compete with Marcus Smart and Jaylen Brown for minutes at the shooting guard behind starter Avery Bradley. Hunter's range from downtown is his primary asset, and he emerged from summer league shooting better than 47 percent from deep, which is certainly encouraging.
Analysis: There are some questions about how effective Sullinger and Valanciunas will be together defensively, as neither one is particularly quick, so while Sullinger might be in the starting five for Toronto he'll probably split minutes fairly evenly with Patterson. That said, the former Celtic is on a one-year 'prove it' deal and will have all the motivation possible to stay in shape and provide the Raptors with the kind of rebounding from the power forward spot they haven't had since Chris Bosh left town.
Analysis: Sullinger became an unrestricted free agent after the Celtics recently withdrew their qualifying offer to him, opening the door for him to sign with the Raptors. While Sullinger's numbers dipped to 10.3 points and 8.3 rebounds in only 23.6 minutes per game last season, he's still just 24 years old and could be motivated by his one-year, 'prove it' deal. With Jonas Valanciunas established as Toronto's starting center, Sullinger should edge rookie first-rounder Jakob Poeltl for backup minutes, while possibly also providing an alternative to Patrick Patterson at power forward in bigger lineups.
Analysis: Mickey's shoulder injury prevented him from suiting up in the Utah Jazz Summer League earlier this month, but judging by his performance Sunday, it looks like he's feeling fine for the Las Vegas Summer League. The 6-foot-8 forward is still buried on the Celtics' frontcourt depth chart, but represents an intriguing prospect for the shot-blocking abilities he offers, despite his undersized frame.
Analysis: Hunter also committed a game-high seven fouls, but the Celtics were likely just happy to see him back on the court after a bone bruise on his right wrist prevented him from playing Thursday. The 22-year-old averaged just 2.7 points and shot 36.7 percent from the field over 8.8 minutes per game as a rookie, and may struggle to find minutes this season behind the backcourt triumvirate of Isaiah Thomas, Avery Bradley and Marcus Smart.