What if FG and HS didn't exist?

Steve, when you're in a hole - stop digging fella.

Music critics don't decide on whether an LP is a concept (or not) - bands do. Did you ever hear anyone from Queen refer to HS as a concept album? thought not. because it isn't.

All of the following:

Beatles - Sgt Peppers Lonely Hearts Club Band
King Crimson - In THe Court of The Crimson King
Green Day – American Idiot
Green Day – 21st Century Breakdown
Marvin Gaye – What's Going On
Jethro Tull - thick as a Brick
Rush - Clockwork Angels
Pink Floyd - DSOTM
Pink Floyd - WYWH
Pink Floyd - Animals
Pink Floyd - The Wall
Pink Floyd - The Final Cut
Small faces - Ogden's Nut Gone Flake
The Moody Blues – In Search of the Lost Chord
ELO - Time
Styx - grand Illusion
Styx - Paradise Theatre
Who - Who Sell Out
Yes – Tales from Topographic Oceans
Iron Maiden – Seventh Son of a Seventh Son
Madonna - Erotica
My Chemical Romance – The Black Parade
David Bowie - The Rise & Fall of...
David Bowie - Aladdin Sane
David Bowie - Low
David Bowie - Diamond Dogs
Genesis – The Lamb Lies Down on Broadway
Alice Cooper – Welcome to My Nightmare
The Alan Parsons Project – Eye in the Sky
The Band - The band
Duran Duran - 7 & The Ragged Toger
Eagles - Hotel California
Eagles - Desperado
Marillion - Misplaced Childhood

are concept albums. even Kiss - Music From (the fucking) Elder is a concept album

Steve, there are hundreds and hundreds of online lists of concept albums - and Hot Space is consistently absent from every single one of those lists. It ain't a concept album.