McCain Into the Fire: Thunder's Backcourt Decimation Opens Game 5 Starting Spot

Jalen Williams is officially out for Game 5 of Oklahoma City's Western Conference Finals matchup Tuesday night, downgraded from questionable after failing to clear his strained left hamstring. The Thunder compounded the absence by ruling out Ajay Mitchell—Williams' typical replacement—with a strained right soleus, forcing the team to elevate Jared McCain into the starting lineup alongside Shai Gilgeous-Alexander, Chet Holmgren, Isaiah Hartenstein, and Luguentz Dort. McCain, a reserve who has averaged 8.8 points across 12 playoff games off the bench, will make his first playoff start in an elimination game.

Williams' injury saga has defined the Thunder's season. He has now missed 58 of Oklahoma City's 95 games (regular season plus playoffs combined), with hamstring issues responsible for 39 of those absences. The left hamstring, in particular, has sidelined him for nine playoff games and counting. His last appearance came early in Game 2 against the Spurs—four points in seven first-quarter minutes—before the injury flared. A week earlier, in Game 1 of the series, Williams had logged 37 minutes and scored 26 points in a double-overtime loss, suggesting he was capable of contributing at volume if healthy. That window has now closed.

McCain's insertion into the starting five represents a seismic backcourt realignment for Oklahoma City. The Thunder built their regular-season identity around Gilgeous-Alexander's dominance and ball-handling, with Williams functioning as a secondary creator and athletic defender. McCain offers neither skill at an elite level. His season assist rate sits below 3.0 per game; his three-point percentage hovers around 35%. What he brings is effort and youth, but in an elimination game where every possession carries weight, the market has already digested the downgrade.

For prop bettors, McCain's insertion tilts the entire Thunder offensive architecture. Gilgeous-Alexander's shot volume will likely spike—in previous games without Williams available, SGA's usage climbed into the 32-35% range, up from his series baseline of 29-30%. More critically, the ballhandling burden falls entirely to SGA and Hartenstein in the short roll. McCain's limited passing range means the Thunder lose a secondary playmaker who, when healthy, contributed 4.5+ assists per game in the regular season. Expect Gilgeous-Alexander to eclipse his series average assists total; the line has not yet adjusted for the magnitude of the backcourt vacancy. SGA's assists prop should be targeted at anything over his series average, particularly if it's been set with the assumption of a healthy (or at least a capable reserve) Williams.