That's incorrect. Toriyama did initially just throw out numbers he thought were big because he really wasn't thinking about it. Which is why he pretty much gave up on trying to give numerical figures for the rest of the series. Toyotaro gave a value to Magetta that is easily shown to be woefully inaccurate or just being completely ignorant of everything that's come before. It's why there's no mention of Magetta's weight in the Anime. They just say he's a MetalMen and that these are his traits.
Incorrect. Shin's statement is more in line of worlds or civilizations with advancement on the level of Earth's that may have fighters that could help in the ToP. The whole idea of there being only "24 planets in the universe" is proven immediately wrong by Freeza's Empire, the Galactic Patrol, among other things. So we know that's not what was being implied. Never mind the fact Shin has proven utterly useless as a Supreme Kai.They also said there's 24 planets left in the universe.
An initial goal and nothing more. Recall, his original Base power was 530thousand. Bumping his base up to 1.3mil would be more than doubling his base level. By the end we can see that Freeza blew way passed that goal since, as he openly states himself, that he's never trained before in his life and there's no telling how much power he could draw out if he were to begin training intensely.And one of the first things Frieza said when he got revived was training to get a power level of 1.3 million lol.
The thing is that the Anime does show weight training being use effectively and with the perspective changes of the weights themselves being used it gives a far greater impression as to how much is actually being lifted by Goku and Vegeta. All done without having to give a specific value. Again, Toyotaro's mistake was giving a specific number that can be easily discredited, laughed at, and proven to be an incredibly low figure. As I've already demonstrated.
It's as people have said for a good long while now. Toyotaro just is not a good writer.