They surpassed Freeza and became the strongest in the universe then he moved on to something else not another alien. He didn't mention if he originally planned for Vegeta to be the strongest so I don't know if he actually retconned it. In the Saiyan saga Vegeta referred to himself as the strongest in the universe but I always considered that being the same as Burter calling himself the fastest in the universe when it wasn't necessarily true.
He didn't refer to himself as the strongest, he thought it.
About Dabura I don't know if it was directly stated but I believe he was a Makaioshin. At least that's what I understood from the "Demon Guide" on the main site. In the manga he was said to be the King of Demons and strongest in the Demon Realm. Demon Realm was translated to "makai". He might not be considered a god but at least a deity.
No, he's never stated or implied anywhere to be a Makaioshin. He's probably just a mortal who happens to be stronger than the gods, like Gohan, Goku, and Vegeta.
I agree with most of these. Some of the changes in DBM I think could have been avoided:
1. Hanasia and the two other elites being stronger than King Vegeta. I don't think any Saiyan would respect King Vegeta as their leader if he wasn't the strongest. These other three Saiyans could have been included had a power level of 4000-8000 without contradicting the idea of King Vegeta being the strongest Saiyan at the time. I don't think it was necessary for Bardock's vision to only happen in one universe. It could have happened in all of them but what differentiates U3 is that he decided to warn the king as soon as he found out.
Agreed.
2. Grand Kaioshin blowing his brain before being absorbed. An explanation like "the goodness in his heart or his pure Kaioshin magic was able to partially tame Buu's wild nature" or something like that may have sounded better. Kid Buu wasn't very smart to begin with so I would argue that Fat Buu was equally stupid just less unpredictable and wild.
You'll notice that Fat Buu actually IS a lot smarter than Pure Buu, who can't even form sentences. It always seemed much more likely that combining a mindless feral monster and a wise god just resulted in a dimwitted child-like being. Then ironing out the imperfections resulted in an intelligent and cunning schemer.
3. King Cold being that much stronger than Freeza. I understand the fan theory of King Cold being in his second form but his 4th form possibility surpassing #17 seems a little high. I could see him deciding to train after learning about Kooler's fifth form but I would have had equal to Goku on Namek or slightly stronger. That way he could defeat a weak SSJ without having to be that many times stronger than his sons.
Oooooor he could just stick with his canon level, which is "weaker than Freeza, but probably not by a lot". He doesn't need to be that strong to beat Bardock and Videl- them being strong enough to put up any kind of fight against him in any form, even factoring in KK (x20) and SS (x50), would still make them unimaginably stronger than their main counterparts. What's the problem here?
4. Some of the movie characters. I don't mind Kooler since his first movie isn't difficult to fit into the timeline. I'm not a fan of Broly but I do understand why Salagir included him. Better to use a pre-existing overpowered mutated Saiyan than make up your own I guess. I didn't understand the reason for rewriting Wrath of the Dragon. If he felt the movie couldn't fit on its own then it may have been better to leave out Tapion and Hirudegarn than change their movie. I really doubt Tapion will contribute anything to the story than to just becoming friends with Raichi.
Cooler fits fine, so I don't mind him. Same with Bojack, Hildegarn, and Bardock. Which just makes it baffling that he felt the need to change 3/4 of them. Broly bothers me, because his movies just cannot have happened without Salagir applying fanfiction logic to them and changing them to cram them into the manga's timeline.
I'd just take the same stance on Broly that I do on every other movie character who can't fit: the character does exist in-universe, but his movie didn't happen. Perhaps in U20, for want of a nail, Broly survived something that killed him early and faaaar away from the protagonists in all or most of the other universes?
5. The Future Gohan special. When Goku and Majin Vegeta were fighting I'm pretty sure only Goku's energy was going to Buu's egg. Having Dabura drain his own energy didn't contribute to their goal. Besides if there's a strong intruder running around it may have been wiser to punish Dabura after the intruder has been dealt with. It would have made more sense if Babidi's ship landed, didn't sense any strong power levels, and decided to leave.
That special was the dumbest and worst chapter in the whole fanmanga. Not only because of Babidi acting in a way that makes no sense just to give Gohan a chance, but because it's explicitly stated in the manga that they can only use GOOD energy to revive Buu. Dabra is not a good being, he's evil.
In short, Dabra shouldn't have been able to be drained, and he should have used his Perfect Cell level powers to crush everyone. Assuming they made contact with him, as this special shows, rather than him and the gang just grabbing the ball and leaving.