Also something I noticed, in the video during the stream sub zero did breakaway after the d2 kB quite late, way later than the AI does when you set it up to automatically breakaway on first frame possible. This could mean they either adjusted the time when you could break away, maybe generally, maybe only to certain moves which could increase the chance that b3 after an amp tele could be possible actually or sub was played by a human which would be really bad.
after rewatching it a third time, they actually did a normal d2 where sub could breakaway earlier than after the kb so my hot take would be that after kb launches you cannot immediately breakaway anymore which would make armor breaker more reliable to hit.