My thinking is there isn't a single team in the league that could withstand these injuries, which is why I'm so bummed about the bad luck occurring to some really good people. I don't look at it in terms of positions or ranks, I look at it in terms of roles.
Greg Oden was an elite post defender. The ability to bring a player of Joel Przybilla's caliber as a backup was a strength few other teams in this league had. That's 48 minutes of tremendous rebounding from the five. Now we have to move LMA there or play Juwan Howard. That's a HUGE dropoff.
Nicolas Batum's contribution didn't show up in the stat sheet, but he was our best wing defender and kept defenses honest with his three point shooting. He also fit the starting lineup to a "T".
Travis Outlaw was the focus of our second unit offense. As a "stretch 4" he provided a constant mismatch. He had the ability to create his own shot and bail us out of bad sets. Rudy is our second option in our second unit.
Mills and Pendergraph were unlikely to make any contribution.
However, the loss of those four players not just robbed us of their specific role, but also messed with our rotations and chemistry. Could the elite teams still make the playoffs? Sure. Could they get to the Conference Finals or Championship? Not likely.