Again, I don't see how this doesn't apply to other characters, even within the same company like KOS-MOS who has not one but two associated entities that have helped Sakurai a lot (Namco and Monolithsoft) and Smash in its current form wouldn't be what it is without BOTH of them.
I actually think the Xbox mention and Terry presentation length are kind of weird as far as circumstantial evidence goes. Both were post-announcements, so I'm not understanding using them as analogues to pre-announcement hints.
Thinking about it more, the way "thank you" theory is being talked about seems kind of limited, doesn't it? Why couldn't 2B be a thank you to Yoko Taro for contributing to Sakurai's "never give up" attitude after needing more than a decade to find success. Why couldn't Travis Touchdown or Agent York be a thank you to Suda51 and Swery respectively for being fun drinking buddies? Why couldn't Reimu be a thank you to ZUN for being such an important player in the grassroots scene of Japanese game development, while simultaneously thanking the genre that got him into game development in the first place? Why couldn't Sora be a thank you to Nomura, who he's just longstanding friends with? Why couldn't Mavis Beacon be a thank you for teaching him how to type?
Soul Calibur is absolutely being slept on, but we need don't need to think bigger here, we need to think wider. It genuinely feels like it's anyone's game at this point.
It's really not though. It's going to be a character that means something to Sakurai in some way or another, which limits things.
Also, much like with Terry's announcement, I'm seeing a lot of people who really don't know about fighting games outside of Smash...and as a guru of fighting games, this makes me pretty bummed out. Fighting games come out with the coolest characters, man, you guys don't even know the half of it.
Oh, and before someone says that 'No one knows who Sol Badguy is. Get out of here gamer boomer!" Let me drop some how phat knowledge real quick.
Smash had never gotten this big up until recently as Melee had basically dropped off the face of the earth and there was a time where the Smash Community was essentially dead in terms of competitive play. The biggest face for tournaments is Street Fighter, made by Capcom. We are slowly moving into another age with Capcom that happened int he early 2000s where they just couldn't make a good fighting game and they kinda just dropped off the face of the earth up until Street Fighter 4 brought them back. During this time, one of the biggest fighting games was Guilty Gear X and X2 and people loved it. Sometime around or after 2007, much like how SNK was unable to make more games because they went bankrupt, something happened and Arc System Works couldn't make Guilty Gear anymore. It's unclear and I can't find any information on it, but it was some sort of rights issue. Thus, they made Blazblue, which also is very popular and was considered the spiritual successor to Guilty Gear much int he same way Paper Mario was to SMRPG: not quite the same, but you can tell the love was there.
Then finally, the stars aligned in the heavens and Arc System Works made Guilty Gear Xrd, proof that whatever that struggle was about was now over, and now Guilty Gear Strive is coming out in late 2020...and if you think people aren't excited for it...well, let me just show you the reaction the announcement got at EVO if you don't remember or didn't watch.