I have a few B. Giganteus and I do see some of the behavior you asked about, so i'll try to answer your questions from what i've seen.
Do roaches have some kind of hierarchy?
I have seen certain roaches who got to eat first, and some push others away to get the best spot to rest, if they resist they get nipped by the dominant roach.
Is it like the wolves with an Aplha male/female?
Yes, stronger, larger males are the ones who have the best chance to mate with the females, this is best seen in hissers.
Is it like the ants with some kind of queen person.
I havent heard about only one female roach able to mate in a colony, roaches are good breeders and I would think any mature,virgin roach who hasnt mated is fair game to be mated with.
Are they all like single indivuals living together, no ranking, no responsibilities?
Besides a big male hisser who may not allow another male to mate without a fight, yes, I think all roaches have one purpose, to grow,mate, and reproduce as fast ad possible before dying or being eaten.
Is it normal for males to fight each other to be the one to mate with that female? If so, is there normal with casualties?
Yes, hissers and blaberus giganteus males will fight eachother and some will fight to the death biting and mauling their opponent, they mostly go for the wings and legs. (except hissers who lack wings)
Will females mate with different males or just keep to one singel male?
I think a female mates only once before being pregnant for life. But they make it hard for the male because while they are mating the female will drag the male around which is why he must be fit and strong or mating may not be sucessful.
Are they territorial? Like one roach sticks to his or her corner when not seraching for food and stuff?
I believe so, as i've seen this with my roaches, especially over the best place to rest during the day.
Hope I could help!