That's just you and some of you friends that can't admit the idea that there is other possibilities.
The thing is though is that, looking at it as straightforward as possible, those "possibilities" don't work. The two "points" you bring up as evidence that South Kaioushin weakened Buu are easily counterable, whereas the points we bring up don't really have any counters to them whatsoever.
1) You mention that the East Kaioushin and Kibito being rejected by Dabura for restoring Buu means that their ki is incompatible with Buu...why? Why is it specifically the nature of their ki that makes them unusable? One can easily argue that, given the context of the statement, that it was the size of their ki that made them unusable. He goes right from saying that they can't use their ki to pointing out that Goku and the other Saiya-jin have marvelous ki, and Babi-di confirms with him that they'd get more than enough to revive Buu just from them. Nothing is suggested that it's the nature of their ki, but just that they weren't powerful enough to do the trick, which fits what we know about their strength.
2) You mention the Potaras not working within Buu. This again doesn't actually speak to whether the Kaioushin themselves are incompatible, because when it comes to absorptions, we're talking about ki, not magic. Buu is a magical being that has existed since time immemorial, and the effects of the Potara are themselves some form of Kaioushin magic. As such, it'd make sense that there might be some incompatibility with the ambient magic inside Buu's body and the effects of the Potara. That being said, that doesn't end up meaning that a Kaioushin would have the same incompatible nature. While they do practice magic to an extent, they're not entirely made of magic. If they were made of magic, then sure, it'd make sense for them not to interact correctly, but they're not. They still are ki based, predominantly, just with the ability to practice magic.
You also mentioned that Goku's seemingly lied to Vegeta about their need to fuse in order to beat Evil Buu because he wanted to protect Vegeta, because if he died again, he'd cease to exist entirely. That doesn't make sense given what we're shown if we go by your belief that Pure Buu is stronger. If Pure Buu is stronger than Evil Buu is, that would be all the more necessary of a situation for them to fuse to protect Vegeta's life than before, because Vegeta's still dead throughout most of the battle with Pure Buu, and thus is just as at risk as before. Hell, Goku even lets a dead Vegeta try and stall Buu for a minute rather than suggest something like the Fusion Dance.
You're basically saying that Goku lied to protect Vegeta against one opponent, but is willing to let Vegeta go mess around with someone stronger for a minute or so (AND thinks that Vegeta would be able to last that long against him). For us to believe that his line was a lie, we need evidence to support that it was. However, since nothing is said actually saying or suggesting he was lying, and that Goku's later actions show that he didn't have as high a concern for Vegeta's safety as you're suggesting, then we have to assume that Goku's statement about them being unable to beat Evil Buu is factual, and as a result, Evil Buu is stronger than Pure Buu.
Are you serious ? 
