uh, yeah, most of the time they do. they take into account the time factor, and the idea that new and more advanced weapons and vehicles would suddenly popup is one thing but bungie are once again changing the enemys so now the brutes are in a tribe hirearchy with new uniforms and a different backstory, tweaking things is one ...err thing, but this is heading down that geroge lucas, head up there own ass route, next up masterchief will be on about his midichlorian count