Michigan's top options had a tough time creating good looks at the rim.
Injuries. Let's get this out of the way. Michigan managed to make the tournament despite losing Caris LeVert, who was playing at an All-American level when injury struck, and Spike Albrecht, whose absence kept Derrick Walton on the court for huge minute totals and caused John Beilein to give Andrew Dakich a spot at the end of the rotation. Add in Zak Irvin's wonky back, which affected his shot well into the season, and Derrick Walton still not looking like the player he was before his sophomore-year injury, and it's fair to say health cost the Wolverines at least a couple wins.
The center position. Moe Wagner's late emergence provided hope for the future. For most of the season, however, the center position was the source of much consternation. Ricky Doyle, the presumed starter heading into the season, took a huge step backward as a sophomore; his turnover rate nearly doubled and his teammates clearly lost trust in him as a result. Doyle's struggles may be attributed to the late-season revelation he suffers from sleep apnea, but that realization came too late to save his season or, ultimately, his career at Michigan.
Mark Donnal stepped into the void and improved markedly from his first year of game action. That said, he still had obvious deficiencies, especially on defense. Getting beat up by AJ Hammons is one thing; making Alex Olah look like Hakeem Olajuwon for the second straight year is another. Unless Donnal gets a lot stronger or becomes a legitimate three-point threat, he seems best suited as a backup center; deploying him against opposing backups would mitigate his weaknesses. For that to happen, though, Wagner must cut his foul rate significantly.
Perimeter defense. It was bad, even by the mediocre standard of previous Beilein squads. Michigan's best perimeter defenders, MAAR and Derrick Walton, had uneven seasons on that end of the floor—especially Walton, who'd vacillate from awful performances to good ones with little indication of what he'd bring on a given day. The three spot the biggest sore spot with Duncan Robinson somehow looking sigificantly less bad than Aubrey Dawkins by the end of the season; Robinson was still quite far from good.
The Wolverines were especially poor in the halfcourt. While their transition eFG% allowed fell in the middle of the NCAA pack, they were 273rd out of 351 teams in non-transition eFG% defense, per hoop-math. The problems were myriad: fighting through screens, guarding isolation, contesting shots, weakside rotation—you name it, really. The problems on the perimeter were amplified by the lack of a rim protector; they still started on the perimeter.
via Shot Analytics
Stars taking one step back for every step forward. There were encouraging developments out of both Zak Irvin and Derrick Walton this season. Irvin did an admirable job playing out of position on defense and rounded out his offensive repertoire, nearly doubling his assist rate. Walton posted center-level defensive rebounding numbers and returned to his freshman form as a perimeter shooter.
But with their bigger roles, flaws were exposed. Irvin's forays to the hoop increasingly resulted in turnovers as the season wore on; his handles still need work and teams exploited the fact that he was far more likely to try to kick the ball out than finish in traffic. Walton simply couldn't finish at the rim, continuing an alarming trend from his injury-plagued sophomore season.
This is where LeVert's absence hurt the most. The only player Michigan could rely upon to consistently generate a decent look—MAAR—still had a limited game; while he could weave his way to the basket in LeVert-like fashion, he wasn't nearly on LeVert's level as a shot-creator for others. Rahkman becoming a better all-around offensive player would be huge for the 2016-17 squad. It's becoming harder and harder to expect Irvin or Walton to live up to the expectations set by M's previous top options.