When Vala in Daniel's body says, "Anybody?", we see an image of Daniel's body in the monitor when she says it. Daniel's head movements are much more flamboyant than Vala's despite both being views of the same body.
Colonel Chekov's leverage over the SGC is that Russia will remove the stargate from the SGC, because the stargate is technically on loan from Russia. However, Stargate Command has, many times, removed stargates from other worlds for use elsewhere in the galaxy (or in the Pegasus galaxy). They would have no problem obtaining another stargate for their own daily use, if indeed, they don't already have several on hand.