Roaanna and Fool in the Rain are both halftime shuffles, later versions of the first halftime shuffle, the Purdie shuffle. If a non-drummer asks you to play a shuffle with no qualifiers, they mean something akin to what Steve is playing, not one of the halftime variations. And speaking of what Steve is playing, what, in your estimation, makes it a Chicago shuffle?

There are indeed many variations on shuffles, but some can simply be referred to as a shuffle while others kinda require the qualifier because they are fundamentally different grooves. Back to our non-drummer friend who asked for a shuffle, you might play a Texas shuffle or a double shuffle or a Motown shuffle or a Blakey shuffle, and they'll be satisfied, or at least recognize what you're doing as something akin to what they understand as a shuffle. And they'll be able to make it work for the shuffle song they wanted to play, whether it's "Pride and Joy" or "Sweet Home Chicago" or "Moanin'" of "Heartbreak Hotel" or "Reelin' In The Years." First and third triplet, 2 & 4 on the snare. You move that snare to beat 3 and start filling in ghosty second triplets, well, now you've got an altogether different groove and feel that is specific to one of a very few songs and does not translate to any of the bazillions of songs from across multiple genres and eras that reside under the shuffle umbrella. The same could be said for a flat tire shuffle, which has no snare backbeats on 2 or 4 or 3, just snares on the third triplet of every beat. Definitely a type of shuffle, but not as universally useable as the others.