I swear people overhype Chris sometimes. I like Chris as much as the next man but he wasn't superhuman. Yes he was ex-military, doesn't mean he was Jack Bauer. In the end his training Marlo's goons didn't amount to shyt since all of them except Michael(who was naturally smart and brave) didn't amount to shyt. His next best student was O-Dog, and he was a mook.
As far as his tactical acumen, yes he had it, but it wasn't anything exclusive. Omar and Brother Mouzone also had it, and Cutty and Slim Charles had it too. See in season 3 where they're planning the (failed) attack on Marlo's corner. They have a drawn map of the street and they plan a pincer movement. Yeah the attack failed because of that fat approval-seeking fukkboi who jumped the gun, but the planning was top notch.
In a nutshell, Chris was dangerous, but so were Wee-Bey, Slim Charles and several others from Avon's crew. Like Chris himself said, "any nikka can be got". No one is invincible on the street.