Saniss wrote:"Bryan Cranston, as I see it, has portrayed these 5 distinct characters throughout the run of the series."

I like this, except I'd have titled the last one "I have no idea who the fuck I am anymore".
Walter White's new alias is "Lambert" (which is Skyler and Marie's maiden name).




I had to go back and rewatch the flash forward cold opening of episode 5.1.
The episode opens a year into the future in a Denny's restaurant, across the street from the University of New Mexico in Albuquerque. Walt, full head of hair, full beard, new glasses and no wedding ring, is sitting alone and is served his breakfast: bacon, eggs and hashbrowns. Walt breaks the pieces of bacon in half, then arranges the pieces into the number "52" (which recalls the pilot episode).
A waitress tries to make conversation with him, Walt gives her the aforementioned fake name by showing her his ID from New Hampshire. Walt goes to the bathroom, swaps an envelope of cash for a set of keys in the bathroom with Lawson, his previous gun dealer. Lawson asks Walt for his word that "it" won't be crossing the border. Walt assures him that "it" won't be leaving town. Before exiting the bathroom, Walt lets out a slight cough and pops a pill. He then leaves a $100 tip for the waitress, exits the diner and locates the car that the keys belong to. Opening the trunk, "it" is revealed to be an M60 machine gun with ammunition, which has to be to kill Jack and his crew (or the czechs).
Before Lawson left the bathroom, he wished Walt luck ("Well...good luck, I guess"), and as shown in the opening flash forward of episode 5.9, Walt then goes straight to the house to get the ricin.
Walt is coming back to protect Skyler and the kids, who he thought were safe following his pretend Heisenberg theatrics over the phone, from his past. Whether Jesse has anything to do with the White family being in danger, who knows? Lydia obviously knows about his family and his real identity, but for all we know her existence and Walt deciding that she lives gave her the motivation to act as a buffer between the czech end of things and Walt's life. And her coming to the carwash seemed out of pure desperation, like she needed him to know that regardless if he is 'out' or not, the fact that the purity has gone down could have serious consequences not just for her but for everybody else involved.
I think the phonecall to Skyler and the police was the end of Heisenberg. Heisenberg, who is Walt's super alter-ego, was in the empire business. Walt's now in the family protecting business, which of course means destroying any trace of his business empire (Blue Sky being back on the streets, his ex-partner, who is now making said blue meth for Todd and Lydia, and former associates) that will lead back to his family.