Now that I think about it, the fact that Mai is not in smash because she is very suggestive is not negative in KOS-MOS,
In fact it is the other way around because it would make a little sense of the existence of KOS-MOS Re;
First as a symbol of the rebirth of the character himself as well as of a future saga, and Second to adapt it to current times censoring it a bit but keeping it as a pretty and powerful woman
Even T-elos received a little censorship very much like Mythra when they did her own revision with lingerie through an update.
Do not you think the good communication that there is from Namco to Monolith soft through these changes? that is to say, I understand that in Smash Mythra was censored, but what need was there to make canon lingerie within Xenoblade 2 by means of a patch?
Again, Even within smash they took the trouble to create new art just so that Mythra appeared as a spirit, when they could perfectly have left her out of the game like Mai.
I put myself in the place of Namco creatives and they had to think about the following:
"Guys, KOS-MOS will be the last DLC, we have to create a new image, it will be our pet for the new future of the Xeno franchise, Xenoblade 1 and 2 will lay the foundations of the multiverse we are going to create.
We have Resources this time we just need to gain in popularity so Smash will provide it to us and we need to redesign KOSMOS so that it adapts well in the next titles we develop. "
By the way I have a higher degree in marketing, and I have seen this in characters from other franchises I will give you an example: Ryu Hayabusa, was redesigned for his new trilogy Hack and Slash.
I doubt that they have taken so much trouble to create these designs so that they appeared in a game like playable cameo, even if it were only that way it would be more logical to preserve their current design by nostalgia and fanservice.
For things like that and the fact that Rex is in a suit being a first party element in a pass that is full of third party characters
or the absence of any spirit of Xenosaga which makes me think that KOSMOS will definitely be the next.
https://i.redd.it/rzh0iolqwlu31.jpg