Ex-Rockstar dev thinks some cut GTA 5 stuff could end up in GTA 6

Saw this on Dexerto. Former Rockstar dev John Ricchio was talking about GTA 5's cut content and dropped a little hint that some of it might have been saved for GTA 6. He didn't name anything specific, just said it's possible some ideas that got axed from 5 could show up in Leonida.
We already know Rockstar recycles concepts. RDR2's weapon maintenance and horse bonding were originally prototyped for GTA 5 but didn't make the cut. So it's not a stretch to think they've been sitting on other stuff for over a decade, waiting for the right game.
Makes you wonder what else was on the cutting room floor. The single-player DLC that never happened. The casino that sat there for years before Online finally opened it. Maybe some of those heist ideas or side activities were just too ambitious for the PS3 hardware. Now with the Series X and PS5, they could actually pull it off.
I'm not expecting a 1:1 port of old code, but the DNA of those scrapped features might be in there. A more dynamic stock market? Proper gang territory wars? The ability to buy multiple safehouses and actually customize them? All stuff the community has been begging for since 2013.
What cut GTA 5 content would you love to see make a comeback in Leonida?
Source: Dexerto · Curated content.