When pushed far enough into a corner, Walt just might be the Baddest MF'er out of all of them, Axe bros, Gus, P.I., etc... can't hold a candle to Heisenberg pissed.
Now lets break down the contribution of all parties involved here and see if we can assign a value to each one, Gus was acting like they were all equal, and they're not IMO.
Gus goes through 200lbs a week.
These street level nickel and dimers were selling a pound a month, tops, and even that's a stretch at a teen(1.75 grams) per sale, so, that means they represent .5% of Gus's business, nothing basically.
Walt is THE MAN, the one who makes it all possible with his recipe and technical expertise.
I full well expected Jesse to be brought into the trailer and shown the bodies of those two guys and told that's the end of it, and not have to just "take it" and shake hands with them like it was a simple playground fight between them.
Series Finale, Walt with machine guns in each hand, takes out Gus's whole crew, catches a few rounds himself, and dies in Skylar's arms. My prediction
I think walt is about to take gus's entire organization away from him. Look at how he has moved up the latter every season. I think he has just taken one more step, and we are gonna see who gus's boss is in south america.