The CacoMallow leak is not worth much attention though.
It can be real, but at the same time, it's most likely fake. Smash Ultimate mods exist.
They say that mii costumes are hard to mod without flaws, though if a modder managed to get it right and wants to make a fake leak, they obviously won't reveal you that said mod is possible until the leak is disproven.
Also, as we said multiple times in the past, those costumes (hats only to be more precise) don't necessarily mean that Geno and Doomguy will be DLCs, they can even deconfirm those character in some circumstances. So, even if it's real, there isn't much information in it.
Lastly, those models are yes original/never seen before, but they are also very simple to craft, and I can totally see them being fanmade.
Similar to how there were a lot of leaks with Rhythm Heaven characters in them, because they are flat simple drawings and are simple to fake.
My conclusion is that I don't care about that leak because not only it can easily be fake, it also has the potential of being completely useless speculation-wise even if it's true.
Then it can be true, I don't deny that, but as I said, it's too vague to tell us any useful information.