Yes, the very last think a DEA low level supervisor would do is further his "legitimate" career by progressively wiping out his drug competition to expand his secret drug operation. And that each promotion he gets and accolades he gets amasses him more and more power to move against competition at a higher level and is given more and more discretion by his superiors because he's seen as a riser and a closer at work.
Again, notice the pattern of death around Hank.
- Hank is the last to see Tuco alive. And more than that, ends his life in a shootout. Making Hank the hero and wiping out his competition. Ironically the blue meth after that, it's distribution goes wider
- Hank is the subject of no less than three attacks or potential attacks. First the turtle bombing, where Hank miraculously survives but almost everyone else there is killed or maimed. The twins come to kill him, right as he is disarmed and seen as without his DEA protection. His reasoning for survival is he gets a phone call warning him, but he doesn't know who it is or why.
-The threat against him that is credible enough from Fring where DEA agents are guarding him, then suddenly Fring is blown to bits and so is the old guy in the wheelchair. The last person to see wheelchair guy? Hank.
- Hank is one of the last people to talk to Mike Ermentrout. The guy disappears off the face of the planet.
- Hank is one of the last people to talk to Mike's men, and when it seems one is prime to flip and rat out Fring's operation, suddenly all are killed, and the one most likely to sing is burned alive in his cell.
- Not to mention, that Radio Shack style GPS tracker, it still requires some type of software, some kind of digital footprint is left behind. How is Hank going to explain using a private tracker on Fring and then again on Walt when his boss told him to leave Fring alone. Walt can use this against Hank, saying Hank forced Walt to be part of that.
- How did Hank pay for all those expensive medical bills? Ones that clearly outstripped his ability to earn and even combined with his wifes. His best cover story is Walts story, that Walt a mild mannered dying Chemistry teacher turned into a gambling savant and then turned into a car wash king.
- Gomez might not have reported it,but he remembers when Hank flies off the handle, walks into a bar to instigate a fight.
- His wife is privately known as a shoplifter and thief, but Hank consistently gets her a pass or uses his law enforcement pals to get her off with a pass.
Hank keeps reopening a case that made his career, that is seen as some kind of miracle that Hank could have this powerful intuition that veteran DEA agents with decades on the job aren't picking up on themselves, and each time, more and more people are dying at a higher and higher level on the drug foodchain and now the blue meth has become a global problem. Each time Hank reopens the case, the blue meth spreads farther and faster and wider.