I edited cause i don't want to be too daring, but yeah, that makes sense to me. It would be much like Argus with 4 small zones instead of 3.
I did think that the shadowlands didn't fit the regular type of landmass that Blizzard does for xpacs. It would be like being in the Firelands on Deepholm for a full xpac. I don't think that's something they'd do. But for a big patch is seems to be a perfect fit.