Sorry, Ian, your hifalutin, avant taste preempts you from answering this question properly, and you know it.
Zappathustra, all those pieces you listed are prog.
The only time you hear otherwise is when someone has only heard the hits on the radio (so they are clueless about the catalog as a whole), or they have evolved past prog of this caliber into more sophisticated realms, like my friend Ian. There's no looking back when you do and a lot of stuff seems pretty tame in comparison once you go there.
Not every tune on those first eight album is prog, but you can bet the epics are.
If they were not prog we wouldn't be discussing them here and we often do. Meanwhile, their contemporaries like Journey, Boston, Styx, etc don't come up much because there isn't much prog in their catalogs to discuss. None of them have arrangements as grand as SFA, Magnum O, etc...
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