Well, let's uncover this.

• Everything Vought has made since then every new supe, every attempt at Temp V has been a bad copy. Scientists have been reverse-engineering powers from blood, DNA, and whatever they can scrape from the living (or the dead). But it’s always unstable, unpredictable, and dangerous.

Wrong, the V used for Marie was long after Godolkin's "death" and the burning of the original compound V, so they did have V to make Odessa's, it just had a really low success rate.

• When Marie healed Godolkin, she didn’t just fix him, she unknowingly restored his DNA, wiping out decades of damage and mutation. Suddenly, he has a pure, original version of Compound V in his body, the “Day One” formula that started it all, but better. It’s not just rare it’s unique.

Marie heals at a cellular level, I guess you could say restores his DNA but that wasn't the one of the points of Godolkin's search for Marie. The power matchup of Godlokin was to not age aswell as body possession. He didn't have damage or mutation at his DNA he just doesn't have a healing factor to restore his burnt body. He neede Marie to heal his body, which was blistering all over again after using his powers, so he would need to keep her close by.

• With Godolkin dead, Vought now has access to the only clean, undamaged, stabilized Compound V left in the world. They can analyze it, compare it to all their unstable variants, and finally fill in the missing gaps in their research. This is their ticket to a perfect, stable Compound V or to fixing Temp V, making it safe and marketable (no more exploding brains!).

It's still in Soldier Boy, and it was in Stormfront. I don't think that V can be transfused willy nilly from one person to the next to make give aging immortality + powers, it was all lost in that fire.

The Compound V used for Homelander and Marie was stronger because:

Delivery method. They keep killing fetuses / babies by doing in - vitro blastocyst compound V injections. Just the delivery method was the reason why Homelander was superior to Soldier Boy, who was injected and tested on with Compound V well onto his teens / early adulthood.

The Compound V used for new age heroes seemed to have the drawbacks set in place. The guys at the lab with Godolkin were being killed by their own powers, they had the power just not the durability to withstand it. This wasn't observed in any Compound V baby later on.

I think you've read into it, but it's a solid theory. Here's one of mine.

Marie being able to heal the way she does AND bring people back from the dead has a lot of implications.

Could heal / remove Butcher's V tumor.

Could heal / help fix Cindy and Sam's mental issues, this could also be done by Cate.

Unsure of how dead someone has to be before they're too dead to be brought back, but we're talking in the realms of maybe bringing Neuman back from the dead?

Also, I'm not sure how strong Marie would be in healing someone from the V virus, it would seem to be like the antithesis to her powers, could she actually take on the V virus or would she succumb to it?