For sure, I agree with you, but just looking at the facts shown in the show itself. Steven, in kaiju form, was able to hold his own against all of the strongest characters in the show at once. The only way the stopped him was exploiting his only real weakness and that's his fragile emotions. Steven was able to resist the grasp of an entity larger than the Earth itself all while giving all of the CGs and Diamonds a proper fucking. Outside of kaiju form, Steven was able to shatter, in my opinion, the 5th strongest, non-fusion gem in the Universe with ease. His suite of powers is obscene, but underdeveloped at the same time. Let's see what he's got:>Nearly indestructible hard-light projection.>Super strength.>Super durability.>Healing/Regenerative powers.>Astral projection>Bodyjacking>Necromancy>Flight>Pink thrall facilitated teleportation.>Shapeshifting>Age-related immortality.>Ability to bring plants to life.>Super, time-warping speed.
I'm sure I missed some, but you get the point. Steven is absolutely busted with all the shit Sucrose gave him. No one, in universe, comes close.