Are we sure Gohan isn't a Legendary Super Saiyan ?
Bare with me I have an idea, now for context I'm aware Legendary Super Saiyan is the name given to DBZ Broly, I am using it in place of DBS Broly's Form as it is easier and more consistent than the names he currently has for it.
Now what I mean by this is, I hypothesis that Gohan is like Broly, a mutant Saiyan, my basis for this is the sheer rage they both share.
now, that isn't to say no other Saiyan gets angry or to ignore Gohan's hybrid Saiyan origin, however in that regard if we observe the other instances of hybrid Saiyans neither (for this we observe Trunks and Goten as both are 50% Saiyan like Gohan and have been observed in combat) exhibit the same extreme power boost that Gohan experienced with his rage moments.
Remember Gohan at age four experienced a power boost with his rage so powerful he was able to injure Radius who was multiple times stronger than himself(most sources say Gohan had a power level of 3 and jumped to a power level of 1307, which if cannon is a roughly 453x boost), neither Goten or trunks received such a boost in any arcs they were in, this include future trunks as while his rage moments were more explosive than his younger self's, with the exception of super Saiyan rage which I would chalk up more to him getting Godly Ki by training with Past Vegeta ( though I fully admit this is my interpretation and could be wrong).
From what can be observed Gohan's rage is massively powerful and more potent than other Half Saiyans, which leads me to the only other massive increase Via Rage we see in the series.
In DBS Super Broly, we discover that Broly a mutant of the Saiyan species is able to access the boost of Ozaru form without having access to his tail or the full moon. We also observe the longer he fights the stronger he gets, going from getting manhandled by Ssj1 Vegeta to being able to harm Ssj blue Goku and Vegeta before going Super/Legendary Super Saiyan.
Now assumedly the reason Gohan Was not born with Broly's power level (10,000) is due to his Half human origins, shoving his potential away until his body could handle it (which granted is a stretch though possible as our IRL Bodies hold us back from functioning at 100% as well).
Which then leads me to their transformations, it is widely believed that Gohan's Ssj2 has a higher multiple than other Ssj2 transformations, especially when Gohan is in a state of Combat Atrophy(I.E Buu Saga) during the fight with Dabura who was stated to be as strong as Perfect cell, Gohan was still stronger than him and was able to defeat him. It also never takes long to train Gohan back up to his peak, (I.E Gohan's training with piccolo during the tournament of power that made him on par with that version of Ssj blue Goku )
And this becomes even more amplified when you take into account Gohan's New Gohan Beast form, which I feel like is the equivalent to Broly's Full power Super Saiyan/Legendary Super Saiyan form.
So with all that in mind while I don't believe there will be a twist reveal that Gohan was a Legendary Super Saiyan the whole time it's interesting how alike both Broly and Gohan are, maybe if Paragus was more like Goku or Piccolo Broly would have been more well adjusted and even more powerful.