Every single one of these assumptions failed. Mujib escaped (he was arrested later, but his declaration of independence had already been broadcast). Instead of decapitating the movement, the army’s killing of unarmed civilians (especially at Dhaka University) created millions of refugees. And the Biharis, while loyal, were militarily useless without Pakistani officers.
Matinuddin wrote with the rigor of a general and the honesty of a dissenter (the book was initially suppressed in Pakistan). This is extra quality because it doesn't offer easy villains—only a painful autopsy of systemic hubris. Every single one of these assumptions failed