Another bread crumb!!!
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Look at how Zero is named. He's got a (Megaman) attached. He's the only assist trophy to have such a thing on their name. Could this be implying that another Zero is an Assist Trophy? If so, then it's likely Kirby's Zero.
Where would be the PERFECT place to reveal such an iconic assist trophy? That's right. A CHARACTER Trailer. A Kirby related character trailer, I might add
What do you think? Am I reaching too hard?
Honestly, I don't think you're reaching too hard at all. That's a great find! There are a great many video game characters named Zero, but none are coming immediately to mind that could get into Smash. I would absolutely love to see Zero represented!
The only issue is that Kirby already got an assist trophy in Kawasaki. It's not as if there's a limit, but that might make it harder for our Zero. Him also being a boss would fix that, and I would
love to fight that giant eye in Smash.
Either way, it's definitely significant that Mega Man's Zero got that extra distinction. That means there is for sure another Zero as an assist. And what's more, since it's on the site and not in the game, that may mean they intend to show this other Zero and catalogue him on the site--in other words, before the game is released. And if they had had Kirby Zero waiting in the wings as merely an assist, I feel they would have just shown him right after MM Zero to play with the name connection, or at least in that segment rather than Kawasaki.
This leads me to believe they are saving Zero...for a trailer.
And that, my friend, is reaching.