They didn't. It's clear what they meant. You are trying to create your own story here instead of taking what has been given.
Not really. Lumping two characters and saying they're strong doesn't put them on same category.
So the way retcons work is that they supersede previous material and a new interpretation of the material must now be made. This is how it works.
Yes, but when talking specifically of how things were written makes difference between one thing and other. For example, some can say of how strong Gogeta would have been on manga if scripted on 90's and another's according of recent material. There are two areas which are divided.
Source material that contradicts previous source material retcons it. So the previous source material is no longer valid.
Problem's this seems of being manga-exclusive, why do I refer of this? For example, when something appears on manga or anime and doesn't corroborate both ways, there's fundamentally skeptism among both areas and makes exclusive from one way or other. If both manga and anime synthonize same idea, yes, retcon's applied, w/have examples of Potara being 1 hour, androids being able of getting stronger through training, ultimate form being configured, mentioning some. If anime haven't Vegeta saying 17 that, then it's not fundamentally an idea of Toriyama's work.
Yeah, so your argument is essentially invalid. As long as you admit it, I'm cool.
DBS Manga's full of horrible writing, someone keeping skeptism of that's isn't neccesarily invalid.