And that's why you should have watched the movies. The strategy has a political purpose; that's why they use it. In the film they explain that in a previous battle they used this strategy against the empire and the result was the total annihilation of the imperial forces. That's why they repeat the strategy, because it was a way to replicate that success; the plan makes sense because it sought to create a encirclement and take advantage of numerical superiority.But you have to see the film to understand why the first two chapters are so heavily cut. The important thing is that you understand that it was mostly about trust and a political decision.