Just watched Across the Spiderverse and the way the multiverse is being explained doesn’t really make sense to me.

Miguel states that Miles being bitten wasn’t supposed to happen, but how can he break/rewrite the universe’s Canon when the spider that bit him was brought there by Ohn in their own universe?

If the multiverse collidor was being built by Fisk prior to any multiversal manipulations to their universe, then in theory the spider would’ve always been brought over, right?

And wouldn’t Miles’s universe be breaking down already then if he is an anomaly that caused Peter’s death, just like with Miguel’s alt world?

And if it was Miles’s actions that resulted in the creation of the Spot, shouldn’t the Spot also then be a multiversal break? Maybe he’s not a break in the Spider-Man Canon but is still an unintended result that greatly affects the Multiverse.

And since the Spot is the resulted creation by Miles becoming Spider-Man, had the Spot not been created, Miles’s dad wouldn’t be killed anyways. If Miles is indeed not intended to be Spider-Man, then wouldn’t it be unnecessary for the universe’s original previous timeline to need that Canon event in place? And so then what Canon is Miles possibly breaking by saving his Dad?

If it is a Canon point for Miles, then that means the universe intended for Miles to become Spider-Man and adjusted the Canon intentionally, right?

And if every universe needs a set Canon that must occur - that is incredibly specific and I don’t see how every possible version of Spider-Man could abide by that. There’s many versions of Spider-Man where a Captain doesn’t necessarily die. Tobey and 1994 TAS universe being an example. For these universes it’s at least not a plotline that actively shows a core moment in Spidey’s character journey.

It seems like Miguel doesn’t really understand everything fully.

Is there something key I’m missing here? I haven’t read every comic multiverse crossover, so is there something explained there that I’m missing?