This is correct. It’s not a matter of rewriting the story, quite the opposite - I’m just asking if we’re looking from the right angle.
But that's exactly what you are doing. You have to think from an in-universe perspective. Not from our own perspective.
Solar Flare + Kienzan should be the ultimate weapon, but it isn’t because of PIS. Paralysis is going to be the same.
No, this is the incorrect way to look at it. Goku calls Freeza's double Kienzan an amatuer move. There's something we are missing. We don't understand exactly why our logic doesn't work in their universe, but their universe's logic applies over ours. Kaioshin's paralysis is not the game changer you think it is.
Or maybe Shin only got Gohan because he was off guard? He said something like “I’m not sure I can hold such strong energy”.
Now you are talking. Gohan might be extremely powerful, but he's off guard, and he's not even facing Shin, while also being attacked. He's distracted, off guard, and unaware of where the paralysis is coming from. These factors cannot be dismissed. Shin wants 0 smoke with Dabura, so we are missing something. Surely if Gohan can be restrained, so can Dabura, and Dabura is probably only Super Saiyan 1 level as well. We are missing something. The fact we are missing something does not change the contextual logic of their universe. We cannot hyper-impose our own universe's logic onto theirs. It doesn't work.
But I have yet to see anything suggesting Expected Saiyans > Kaioshin.
Because you weren't paying attention. The introduction of Shin leads us to believe Goku > Shin. Shin admits inferiority right off of the bat. Shin sees the competitive nature of the Saiyans and says that he's not sure who's strongest among the three of them, but that Dabura is top dog in his realm.
All depictions of the Saiyans are of them greatly exceeding Shin's expectations and his bewilderment at their power. This includes their base power.
Babidi didn’t even know they were Saiyans!
Completely irrelevant. Saiyans throughout history have been so weak they might as well be humans at this stage of the game. At the, "strongest fighters in the universe" stage of the game.
And I think Shin’s “I never dreamed they were this powerful” has more impact if Saiyans > Shin > Expected Base Saiyans.
Your personal feelings are irrelevant. The fact of the matter is that Shin, Badibi, and Dabura all feel that the Saiyans are superior to Shin, and then are all blown away to find out that they are even that much stronger than their expectations. That is the context of the story. There is no other interpretation. This is how the story reads. Your dislike of the mess the author makes means nothing to what is actually happening.