Well, Thragg scales a bit above Omni-Man, who had performed the 5.3-exaton feat alongside Invincible and Thaedus, and Conquest (who Invincible fought against in the key where the feat had happened) fears Thragg.
In the meantime, Steven while being all Godzilla-like had been held back by the Cluster, who just by awakening managed 2.467 exatons:
https://www.fanverse.org/blogs/steven-universe-the-cluster-awakens.35958/ (calc seemed contentious, tho).
Although three people sharing the wealth technically means Invincible scales from 1.77 exatons since he, Omni-Man, and Thaedus all caused the destruction of that planet.
Reportedly White Diamond had something to do with the planet's destruction, but nobody ever asked the Crewniverse about the specifics, so I dunno how that scales. I should point out that Steven had caused some noticeable damage to White Diamond when he was in a weaker form of his Pink State and... Well, iirc, Cluster probably had the best shot against Yellow Diamond since it managed to go toe-to-toe with and eventually threw down/demolished Yellow Diamond's warship This bearing in mind a diamond warship is capable of handling Obsidian's attacks with less fuss (should note that the warships are made out of the same material). Then again, the fact that the Cluster can somewhat handle Steven even when Lapis Lazuli and the Diamonds couldn't is telling.
From this, I would imagine Invincible is stronger than Steven, but Steven has a hell of a hax pool that is much more versatile than anything Invincible can pull off. I mean he resists Mind Manip as a monster, plus Steven can project his own thoughts at people without the monster deal; what's telepathy gonna do to Steven? Although Monster Steven is basically a full-on pissed-off Steven, so uh... Hmm.
I think it might be an Incon because I can see where Invincible's AP may do Steven in and where Steven's hax could do Invincible in. Just my take.
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