Let's take the current storyline at face value: Micah Johnson was the only shooter.
We do not know if Johnson went into action with an E&E plan or not. If he did, it failed when he was cornered. If not, then he went in with the understanding he was not going home again.
Until there is tangible evidence to the contrary, we'll go with it.
It is 525 feet from Lamar to Market and about 515 from Commerce to Elm. The classic 'City Block'.
A former soldier demonstrated proficiency with his weapon - he hit what he aimed to hit. He demonstrated discipline and focus, in that he did not put rounds into civilians deliberately or while firing wildly. He shot 11 LEO and killed at least 5 - that's a better than average wounded/kill ratio - 2:1. If one looks at the score card objectively, one vet wiped the floor with Dallas PD. He demonstrated that the definition of 'Soft Targets' must be expanded beyond shopping malls and movie theatres to include even major metro LEO shops.
If you were paying attention to the live streams, you noted how DPD deployed - primarily at intersections for a perimeter, where they huddled behind their cars. You noted how many in uniform were in fit physical condition - and how many would have stroked out during a 100-yard dash. You also noted how few, relatively speaking, were armed with long guns.
Had Johnson been operating with even a single ally of equal skills, it is likely they would have doubled the body count and cleared the AO.
Had there been two Buddy Teams, four men total, the second able to Flank & Spank (TM), DPD would not have known what hit them.
Had there been a dozen shooters equal to Johnson's skill set, broken into 3-Man or 4-Man Fire Teams, DPD would have lost every man on the shift who didn't break and run...
Micah Johnson took the position that America has become a Police State and he decided to take direct action against those who directly enforce the diktats coming from on-high.
Whether you agree with him or not is irrelevant. It is what it is.
As every college professor warns his students: You will see this again.
Welcome to RevWarIII.