Baddest.  In addition to the extremely risky gambit he took to poison that particular cartel, he had a M.A.S.H. tent set up in Mexico for his eventual recovery, stocked with all the the medical supplies those particular individuals would need in case shit went down.  THAT's badass!

I'm not sure if you meant it this way, but my head exploded a tiny bit when I read "Walt = cancer."  It's a perfect metaphor for way his life is right now.  Little actions growing out of control, attacking and infecting everything in his life.  He's dragging everyone down with him.  His illness has expanded beyond his…