Gonna start with Ryu, then Matt, then DDM.
Absolutely nothing suggests Shadow Mario made these bonus realms. There are no scenes which show him creating them. It is never stated anywhere that he did.
"A pathway to another world has opened above our fair land."
Yeah Shadow Mario opened a portal (aka pathway) to another world. Same thing he does throughout the game. Painting portals to other areas. This line never says Shadow Mario created this other world. Just like Shadow Mario didn't create Bianco Hills, he just made a portal that instantly takes the player to that part of the island,
The issue with that is how we see said portals are used. Because what you use is a false comparison. Anytime a character enters a standard level, they
dissolve and
reform from particles. Now let's look at the secret levels. When Mario enters, it's just that.
He does not dissolve like he does with any other level. So these cannot be compared, as the portals Junior makes to access levels work differently from entering a secret level. It's also wacky to just say Junior made a portal to another place at Delfino Island. The secret levels are nowhere on the map, where as every other level is shown to take place on the island. So I can safely say Junior via the brush created these worlds.
Even if Shadow Mario actually created solar systems, he did so with the Magic Paintbrush. It's not his own power. And it's not even his own invention, so it can't even be claimed to be something he can do with prep time. It does not in any way scale to Shadow Mario himself.
I admit the profile wording needs a fix-up, but they still have scaling, which I will explain.
Mario "defeats" Shadow Mario by spraying water onto him. The obvious absurdity of treating water spraying as a Multi-Solar System level attack aside, again this is not Mario's own power. It's a weapon that was created by someone else that he used. Both of the feats, even if they are legitimate, are not performed by Mario or Shadow Mario.
I'll use it as more of a durability feat. Junior mainly attacks Mario via the brush itself. And as shown all over the levels, paint just by touching it can harm you. And since everything Junior creates is via the paint, it scales. He'll also use the brush's paint as an attack in Junior's Journey against other bosses and Koopalings. Additionally, many of the bosses are created by the paint, which Mario can harm. And since it all comes from the brush as the source, it all comes back and scales.
Second statement is about ooze coming into the water. I don't even know how this is supposed to at all support the claim he's creating solar systems. But it's in there.
The paint appearing right next to the secret levels suggests that Shadow Mario himself was doing these via the paint itself.
Power Stars are found ramdomly across the scenery. There's absolutely no proof that Yoshi is crapping them out at that moment, and if you genuinely believe that then you're suggesting that a common fruit has solar system levels of energy to generate a Power Star.
Hell in Super Mario Sunshine you get a Power Star by shooting water at a post-sign, do you think the act of shooting water at a random chunk of wood literally transformed it into a Power Star?
You've used this same argument before, and nothing has changed. Yoshi's always been able to
create stuff by eating fruits. So Yoshi creating a Power Star from eating fruits is not anything new, to say otherwise takes more assumptions. And that second argument. Yikes. Well first off Matt, I think you mean Shine Sprites, not Power Stars. Those are two very different items. Second, there's a difference between creating and containing. In Yoshi's case, he's consistently shown to create via fruits. In your example, we have zero context. It's more likely that it just contains it.
King Boo's realm is indeed called King Boo's illusion, and the starry sky mini game warps are also iffy.
The realm itself was not called an illusion. It also makes very little sense to say the realm is just all an illusion and none of the setting is real. The og mansion was called an illusion, but it's still a feat due to how solid it was and the size. This also applies to Dark Moon, everything King Boo creates is shown to be
solid and something that can actually harm you. This isn't a Mysterio case. Unless you're telling me when Luigi walks on stairs, he's just floating because he thinks he's on something. It's also shown King Boo's creations
hit himself. To say that everything else King Boo creates that isn't the background is silly. Master of Illusions should probably be referring to how tricky Boos can be, with them creating fake doors and stuff. However in those cases, we see those are revealed to be fake. Luigi's Mansion Dark Moon doesn't display this. So I think you'll need more evidence than just the title itself.