I think you're looking too deeply into this. lol.
Tekken 5 DR console was not some hotly anticipated title. And why not include Tekken 5 vanilla in your average, which possibly had the quickest arcade to console conversion.
I didn't include it because Namco themselves said they will never do a T5 release to value their arcade operator business lol.
I'm not so sure T7 will be getting a "second version". Big part of the reason they're using the arcade system they have now is to introduce updates easy and seamless. There's nothing stopping them from continually iterating on this build forever. IIRC the latest patch added a new stage. I expect things to continue on like this. It's possible the game may have quite a bit more content six months from now than it does today, but the name won't change.
Well, unless business wanes and they just decide to slap a subtitle on it to spark more interest.
Could be a possibility. I just think the game needs much more than a simple patch to be complete. Hence why I'm expecting a BR release.