As I said Terry, some will not agree. To me the Holden up to the 70's and a trickle into the 80's was the 48/215 up to HZ (trickle into WB). The rest aren't Holdens, at least not until the deliberate use of the word as you say. It appears quite deliberate when you see HOLDEN Commodore used on late 70's documentation alongside Gemini, Sunbird, Torana, Holden and Statesman. It appears like GMH were deliberately making the transition from the Holden car to the Holden Commodore car whereas otehr stuff stayed as its normal name, despite as you say the apparant inconsistency with HOLDEN badging eg on Gemini whereas Toranas from memory got Lions but not HOLDEN badges.

Monaro is a wierdo alright, it stands aside as an in-between name. Where most Holdens models were named as a Holden followed by luxury level eg Holden Premier the Monaro was a Holden Monaro followed by nothing or GTS or LS or GTS327 or GTS350. I'm not sure if that plenomenon existed all that much outside of Monaro until modern times eg Holden Calais, Holden Calais V etc. Maybe Torana SLR and Torana SLR 5000? I suppose HQ/J Kingswood had a few multi-level names too eg Vacationer, Sandman etc.