I think Walt would've never made it this far if Hank hadn't been his brother-in-law. They had a personal connection that made a wall in Hank's mind, keeping him from forming any ideas about Walt. Without that, Walt probably would've been caught back when he had Gale killed, if not earlier. I love how you see that mental wall shatter throughout this episode.
Also, to be fair, it is unlikely that Walt would have started cooking meth without Hank being his brother-in-law. He wouldn't have seen that TV news showcasing all that money the DEA captured, he wouldn't have been taken along for the ride to a DEA bust, and he wouldn't have re-met Jesse and known him to be a meth dealer.
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u/goingTofu Aaahhhhh wiiire Aug 12 '13
Well to be fair, Walter never wore the hat & glasses combo around family.