Okay, and what prevents them from stepping in after 10 minutes? *points to the Negative Lifestream and storm around Midgar*
And no, Denzel's scene where he goes back to Seventh Heaven wasn't filler that interrupted the Bahamut fight. It hadn't even begun, so I have no clue what you're even talking about. The transition made sense. Denzel said he was going back home, Cloud was going to join the fight. They show him going back home, and then cut to the fight. No jarring interruption of the focus of the conflict and film there. Just it progressing like it was intended. That would've made sense, had they somehow cut to Denzel going to the bar DURING the fight.
But if we know they're isolated, and the fight's starting, why do we need to state the obvious? It's shit like that, that's bad storytelling. We don't need them to state something that anyone with one eye open can tell, and thus break the tension and focus of the final conflict of the film. The atmosphere was dark and fixed on Sephiroth enveloping Cloud in darkness and fighting him to the death. It quite literally was their "moment" so breaking it would be bad.
Hell, the flashback with Cloud and Zack was awesome and very cool, but that too was a bit jarring since we go from their fast paced duel to the death, then the quiet peaceful message from Zack that get's Cloud back on his feet. If you have too many scenes that break the tension, then it makes the conflict fall flat on its face. It's supposed to be one continuous ride from start to finish.
I know Barret wanted to take action but he too grudgingly entrusts it to Cloud. He doesn't let go as easily as Tifa but he still does. So, nay thou.
And they are not, "not paying attention to Cloud" they're trusting him to settle it but then become removed from the equation thanks to Sephiroth and thus can't see everything. Again, you don't need them stating the obvious to come up with that logical and clear conclusion.
AVALANCHE's context to the movie is there already. They support Cloud and come to his aide to stop Bahamut and literally give them a hand and push upwards to fly so he can kill it. If that isn't AC hammering symbolism and the "context" of their appearance in the film, I don't know what is. We don't need a little blurb of them stating the obvious to get that message.