BEIJING — To outside observers, the move may appear to be little more than bureaucratic reshuffling: trim two seats from the nine-member body that governs China by consensus at the pinnacle of the Communist Party.

But the proposal by Chinese leaders to downsize the body, the Politburo Standing Committee, offers one of the clearest windows available into the priorities of the party and the mechanics of power-sharing and factional struggles as the leadership transition nears its climax at a weeklong congress scheduled to open Nov. 8.

The deliberations have taken place in private, in guarded compounds in Beijing and beachside villas east of the capital, but interviews with political insiders paint a portrait of party leaders pushing the change to maximize their holds on power while trying to steer the top echelons of the party away from the sclerosis and cronyism that has set in as more interests have become represented at the top.