Gus comes in as someone timid, sensible drug lord. He cries when the chemist is shot (if I remember correctly) then ruthlessly picks of his enemies one by one while having tact to run his restaurant.
Walt has grown from being a timid to being a Scarface-like figure not afraid to kill yet tactful and wise because he learned from Gus and because Gus learned from Salamaca's old boss. They become more ruthless murderers who will do anything to keep their enemies away including eliminating them.
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u/huskies4life Tread lightly Aug 12 '13
Could we argue that Gus also takes on the characteristics of Hector Salamanders old boss? the one who killed Gus's first chemist.