Ok, I'll take this time to also talk about another consistency in the Robotnik vs Sonic scaling.
Rage Power
In the Comics, there are various times Sonic displayed his Rage, and each time, he has displayed more power than he has normally shown. There is 3 notable times his rage has been in a fight, when his fighting Robotnik.
Sonic Super Special Issue #6
Sonic the Hedgehog Issue #74
Sonic the Hedgehog Issue #175
The most famous and well-known display of his Rage was issue 175, when he damaged the Egg Beater with Rage the 2nd Robotnik never saw before. A clear increase of his power.
The 2nd example back in Issue 74/75 stays consistent on this. When Sonic is calmed (Or rather, not filled with rage), he couldn't even fight Roboticized Robotnik
But earlier, when Sonic was fighting Roboticized Robotnik, he was able to fight him. Sonic is filled with rage at this point, greatly implying Sonic's Rage increased his power.
However!
It's important to note Sally's and Antione's dialogue. Antione equals Sonic's anger from the Hallway during Endgame, which surprises Antione, as Sonic's light heart nature was nowhere to be seen.
The battle in issue 74 was also the 2nd Robotnik's first time seeing Sonic's anger that equaled hallway-angry Sonic. So of course the 2nd Robotnik would be surprised seeing Sonic's Rage giving him more power than he has ever shown before issue 175.
Nobody, not Antione, Bunnie, Snivley, the 2nd Robotnik or anyone else in the verse ever saw Sonic's Rage at the end of the Endgame Arc.
Wait Wait Wait, wouldn't the 2nd Robotnik be aware of this fight?
There is completely no evidence Sonic ever told anyone how angry he was during this fight (his cool image to maintain)
and no one was there to watch it.
The 2nd Robotnik doesn't even share the same history as Prime Robotnik, as he was unaware of Krudzu's existence (issue 1 & Free Comic Book day issue 4)