Key to understanding is the Greek myths of Daedalus (master artisan), creator of the Labyrinth and the Minotaur. All available on Wikipedia. Walt is Daedalus, creator of the Labyrinth, a maze so complicated even the creator was not sure how to escape it. At the center, the Minotaur (part bull/part man, good/evil, right/wrong, Walt/Heisneberg.)
Many many hints in season 5 confirming this. Example: Deadalus (Walt) and son Icarus (Jesse) create wings to escape imprisonment; Icarus flies too close to the sun, wings melt, spreading feathers across the land as he falls to earth. See: Jesse tossing money from car, spreading across the land as it falls from the sky. Scene ends with Jesse on twirling merry-go-round as camera pans upward showing the boy fallen from the sky to the spinning earth. First reference is made when Walt comments outside the Vamanos garage that maybe Mike is getting too big ("like Daedalus flying too close to the sun.") It's really Walt who is guilty. See myth of Perdix (Gale) whom Daedalus has killed because he threatens to overtake him. Perdix is transformed into a partridge in the myth. Lydia appears late in the series, a new character...the return of Perdix, the Partridge...her last name is Quail (another name for partridge).
This is a classic take on the tale of Greek hubris..reaching to be a God. Examples: end of episode he tells Kylar "I forgive you." Only god can forgive. Is the computer destroyed? Walt Yes. Why believe you? "Because I said so." Many other examples.
The ending is clear. See the myth about Ariadne (Gretchen) and Theseus (Elliott) who cause the maze mystery to unravel, and the key role of the black and white sails (which lead to the suicide of Ariadne's former lover, whom she left for Theseus (Gretchen left Walt for Elliott). Just like Gray Matter is combination of the two names, White and Schwartz (German for black). Walt acts when he sees them on TV and she says that Walt only really came up with the company name, nothing else, which enrages him and moves him to fulfill his fate.
Walt/Heisenberg as Minotaur confirmed in Walt Whitman citation as "My Star." The Greek name for the Minotaur is Asperion, meaning "Star." Check it out!