Again, I know I (we) are reaching at straws with this discussion.
But the skrull thing would make sense. Rather, Marvel could easily make it make sense, if they chose to.
How potentially easy would it have been for the Skrull race to grab Alpha Flight while they were off in space on the Plodex ship, take them captive, and replace them with (obviously inexperienced) Skrull shapeshifting warriors?
And how easy (and how cool) would it be if Marvel's upcoming Skrull spectacular were headlined by Alpha Flight busting out of captivity and warning everybody about what has been happening?
And then, Mailman Mike could die in a nice big explosion, saving the world from the Skrulls. Yay, Mikey's a hero. Yay, Mikey's no more!
Goodbye, fake Guardian. Hello, real Guardian!