2. Opponent rebounding
Only the Houston Rockets allowed more rebounds per game than the San Antonio Spurs last season. That simply can't be even close to the case this year if the Silver and Black hope to be successful. The mark of 47.4 rebounds allowed per game was the most allowed in a season in franchise history and often doomed the Spurs in otherwise close games.
Of course, one easy way to make up for a rebound disparity is to hold opponents to a lower overall shooting percentage. The 47.2% the Spurs allowed had them in the bottom third of the league at 22nd in 2021. Opponents missing shots allows for more team rebounds and cuts down on opponent possessions.
Beyond that, the Spurs will need to hope for career rebounding years from guys like Jakob Poeltl, Keldon Johnson, and Derrick White to make up for the lack of a big-man superstar. The size of new additions Jock Landale, Zach Collins, and Thaddeus Young should also naturally help San Antonio with its rebounding woes, but that also depends on their playing time, which is unknown for now.
Tim Duncan and David Robinson aren't walking through that door, and an all-out team effort is needed for the Spurs to counter that.