Um yeah. When a Gohan that is weaker than usual is capable of holding his own against Super Saiyan Goku, even though he shouldn't even be remotely similar to each other(there is more stuff, but I think this is the most obvious example to me).
You're following one instance as oppose to three instances showing the contrary? Please tell me of the other instances your talking about.
Well, if Piccolo has grown so much stronger, than how was his strongest attack only just barely able to faze base Goku, when according to your logic, he should be in the same league as Super Saiyan 2 Goku, which was something that Ultimate Gohan was actually shown to be. That entire part of the story was just overly convoluted unless you take some of the events that happen in the context of the story as outliers.
Or how base Gohan and Piccolo are shown to be on a similar level of power, hell, I'd even say with Gohan being slightly ahead in terms of raw power if Piccolo's showing against the universe 6 Nameks was anything to go off.
Like how Kuririn was suddenly able to push back Goku in his base form. Are you suggesting that Kuririn got so powerful that he could knock back an opponent, which you consider to be on the same level as someone like Super-Buu, even though at his peak he couldn't even budge regular perfect Cell.
Its this sort of thing which is consistently shown throughout that irks me a lot.
If you were to ask me, the base form Saiyans are still firmly in the buu arc levels of power. I think how Goku and vegeta face off with opponents like Basil, who are vastly weaker than Majin Buu, who had already been weakened, kind of proves that point, far more than a one off occassion where SS3 Gotenks is fodderized.