The bezel used for these mock-ups clearly doesn't encompass the whole device, yet nobody has incorporated that aspect of the "leak."
Is that true?

See the seam?
It's the bezel seam which is the least convincing element of the bezel story.
It's very un-apple like. I think it it very unlikely that a device would look like this.
Either another (chrome?) bezel snaps on top of this. Or this isn't an Apple part at all.
C.