That's incorrect. That's why your theory stay a theory.You do know that Goku flat out stated Super Buu was way stronger than him, and he was stronger than Kid Buu, right? And that Piccolo sensed both Majin Vegeta and a suppressed SS3 Goku, and still thought that Gotenks would succeed where they failed (he also sensed Gotenks), even before he learned of SS3? And that Super Buu = Pure Evil Buu + Good Buu and Kid Buu = Super Buu - Good Buu, logically giving Kid Buu the exact same power as Pure Evil Buu?
Logically, Pure Evil Buu and Kid Buu should be the same being, with them looking different because one split off of a Kaioshin-dominated Buu and the other split off a Buu where the Majin influence was in control. They're both called Pure Evil. They're both far stronger than Good Buu. They're both Super Buu without Good Buu.
First of all, Pure Evil Buu can't have the same power as Kid Buu because Evil Buu only takes a part of Fat Buu's power, and Kid Buu is stated to be a lot more powerful than Fat Buu because of the absorption of Kaioshin. You are reasoning like Buu's forms are an equation, but it's not so simple (as the rest of the Buu saga). We know that Pure Evil Buu power + Good Buu power = Fat Buu power.
The absorption of Good Buu by Pure Evil Buu created Super Buu, who is stated to have a more suitable body to fight, to be pure evil, and greater in all aspects. So we can deduce that Super Buu is a version of Fat Buu, but with the evil side dominating (which implies what I said the line above). This form is possible because of the Fat Buu cocoon that Bejita will snatch. And without Good Buu, we recover Kid Buu. Why ? we don't have the answer, but for sure Kid Buu is totally different of Pure Evil Buu.
Fat Buu = Pure Evil Buu + Good Buu powers
Kid Buu > Fat Buu
Super Buu > Fat Buu
If Kid Buu has to be compared to another Buu's form in term of power, it would be Super Buu.
And to conclude, i will add that if you really think that Gotenks SSJ1 is more powerful than Goku, and that you take into account the SSJ's multipliers gave 15 years after the end of the manga, it means that Gotenks SSJ3 is 400 x more powerful than Gotenks SSJ 3
I'm sorry, but it seems...ridiculous





