We saw that when the Civil War started, that we had no idea what was to come next. Then even more crazy after Secret Invasion. But after the Heroic Age started, are we able to predict how the Marvel Universe is going to unfold? Why did Fear Itself happen in HA? Why did AVX happen, instead of after CW of Secret Invasion? Certain things happened during the Heroic Age that were unpredictable to the normal Age of Marvels from before CW. But here we have Odin stuck in Asgard space holding his brothers body, and the All Mothers holding power. Here we have new mutants appearing, whole Scott Summers and Charles Xavier are not part of it.
Are we seeing some sort of phenomena as a result of a return to the Age of Marvels? Previously unknown gods of Asgard resurface suddenly, and the appearance of mutant restoring burning birds are visiting Earth. And now we are seeing this Incursion in the Avengers suddenly, as though some imbalance was set in motion. Maybe the imbalance has been aparent since the Siege of Asgard? Maybe because Asgard has been missing from Asgard space, things have been set in motion to restore the balance, and the end of all this will be Odin on the throne and Asgard in Asgard space? I think Odin has control of the destiny of Midgard and the other 9 worlds. Odin is the key, because he made Midgard what it is, full of Heroes and mutants, and he is the designer. But as soon as the design is changed, (as when Thor brought Asgard to Midgard space), it threw out the balance that Odin designed.
I think Odin wanted to remain in Limbo perpetually fighting Surtur to avoid any chance of any further Ragnaroks. But while Odin was removed from his design, strange things happened to them. CW to DR were the outward indications of this. Even when Thor brought Odin back, reluctantly, the damage had been done and Cul was going to broken out of his confinement by the Red Skull. Even after Fear Itself, Odin didn't rectify the situation and reassume his throne, but fled into hiding and left the power to the All Mothers, so further strange things were to happen resulting in the Phoenix.
Odin dies at the hands of Surtur
Scarlet Witch makes Thor destroy the cycle of Ragnoraks
Scarlet Witch destroys Avengers and Mutants
CW, WWH, SI, DR, Siege, while Asgard is in Midgard space
Odin forcefully returned
Cul attacks and forces Odin to take them both into hiding
Phoenix returns to restore mutants
Come on, look at these impossible outcomes:
The Avengers and "mutant gene" are destroyed
Super heroes are conscripted by a panicky midgardians
Hulk defeats all the Heroes
Skrulls defeat the Earth
Villains take over
Unknown gods appear and kill Thor
Phoenix arrives and restores mutants
Incursion arrives on Earth.
Impossible things are happening now, that never would have happened before.