Whenever you see a picture of the Last Judgment, Christ is coming in glory and the saints are kneeling at His feet, with angels fluttering around Him. The way I always imagined this is that Christ comes back, the earth and heavens are consumed in fire, a new Earth is created on top of the old one, and then the bodies kind of shoot out of the graves and are reunited with their souls for the judgment, and that this is what we are seeing when we see the saints, since they have been called up first. Call Ibranyi crazy if you will, but his vision of the New Jerusalem being built on top of the ashes of the old is quite compelling and believable.
I guess what really happens is that the saints must come down in a way with Christ, like the angels do, having been with Him all the time. That makes more sense, now that I think about it. Otherwise why not show ALL the resurrected people, those of the evil as well as the good, surrounding Christ?
St. Augustine and St. Bernard and other saints will be dropping from the skies like paratroopers.