I'm not sure the OP is something we really want to rely upon for information on what will happen. I noticed that it uses a lot of footage from the first series or it recreates direct scenes from it that are slightly more stylized. Last seasons two OPs didn't show much of an accurate depiction either.

For instance, I do not recall the Gundam Meistars fighting the Trinity's in front of the moon. Celestial Being didn't fight the Trinity's on any serious level much at all in fact.